More than 200 migrants are missing in the Mediterranean Sea after a boat trying to reach Europe broke down, Tunisia's Tap state news agency says.
The Tunisian coast guard and army rescued 570 but up to 270 went missing in the stampede to get off the fishing vessel, the report says.
An operation to rescue the would-be migrants began off the Tunisian Kerkennah islands on Wednesday.
The mainly African migrants were on a boat bound for Italy from Libya.
Search operations were continuing, a Tunisian security official told Reuters news agency.
Tap said two people were confirmed dead during the rescue. Seven were injured and taken to hospital in the port of Sfax, while two pregnant women were taken to the maternity unit.
On Wednesday night, 193 survivors were transferred to the Shusha camp near the Libya-Tunisia border, Tap said.
It said another 385 would be sent to the same camp on Thursday morning.
Italy has faced a massive influx of refugees since the fall of the regime of Zine al-Abidine Ben Ali in Tunisia in January and the outbreak of war in neighbouring Libya.
The Italian island of Lampedusa lies only about 130km (80 miles) off the Tunisian coast.
Italy has complained it is not getting enough help from its EU partners to deal with the influx, which has prompted some European countries to warn they may reimpose border controls.
Burundian soldiers serving with the African Union peace force in Somalia have told us at the BBC they have not been paid since January.
The five months of arrears total an estimated $20m (£12m) for the nearly 4,000 Burundian peacekeepers.
Burundi's army spokesman Col Gaspard Baratuza said the African Union had paid the money into the Bank of the Republic of Burundi.
But he said the central bank had not disbursed the salaries to the soldiers.
'Serving our nation'
The African Union pays the Burundian soldiers, who make up the 9,000-strong Amisom peace force battling Islamist militants in the Somali capital, Mogadishu, slightly more than $1,000 each every month.
The BBC's Prime Ndikumagenge in the Burundian capital Bujumbura says the salaries are not paid in Somalia, but directly into their accounts through Burundi's central bank so the soldiers' families can access the money more easily.
Now our families think we get the money and hide it from them”
End Quote Burundian soldier
Two soldiers, requesting anonymity as they are not allowed to discuss army issues publicly, also told us at the BBC the situation was not sustainable.
"The Amisom force commander from Uganda has told us that the money is being paid on a monthly basis. But in Burundi we do not know where the money is going," one of them told the BBC's Network Africa programme.
"Now our families think we get the money and hide it from them."
They said some soldiers believe the money has been diverted by the government to serve other purposes before being paid to them.
"In short we do not want to be used as commercial objects. We are serving the name of our nation; let it serve ours by paying us on a monthly basis as this has to be," he said.
Col Baratuza, who in an interview with the BBC's Great Lakes Service in April had promised the arrears would be paid that month, said on Wednesday evening the problem would be sorted out soon.
The AU force in Somalia deployed to Mogadishu in 2007 to back the weak interim government.
Somalia has been racked by constant war for more than 20 years - its last functioning national government was toppled in 1991.
China has rejected allegations of involvement in a cyber-spying campaign targeting the Google e-mail accounts of top US officials, military personnel and journalists.
A foreign ministry spokesman said it was "unacceptable" to blame China.
Google has not blamed the Chinese government directly, but says the hacking campaign originated in Jinan.
The US company said its security was not breached but indicated individuals' passwords were obtained through fraud.
Google said Chinese political activists and officials in other Asian countries were also targeted from the Shandong city, which is 400 km (250 miles) south of Beijing.
The White House said it was investigating the reports but did not believe official US government e-mail accounts had been breached.
Safety tips
It is extremely difficult for analysts to determine whether governments or individuals are responsible for such attacks, says the BBC's Adam Brookes in Washington.
But the fact that the victims were people with access to sensitive - even secret - information raises the possibility that this was cyber-espionage rather than cyber-crime, adds our correspondent.
Maggie ShielsTechnology reporter, BBC News, Silicon Valley
Security experts say they are seeing an increase in these so-called spear phishing incidents in which attackers go after specific information or assets and aim at "high value individuals".
One consultant described it as an "epidemic", while another said such attacks are all too easy to perpetrate given the amount of information that lives on the internet about people - from their Twitter stream to their Facebook pages to sites that trace your family tree.
A smart attacker can assemble enough information to "influence and convince" a target that they are receiving a genuine email from someone they know.
However, Chinese foreign ministry spokesman Hong Lei told a news briefing: "Blaming these misdeeds on China is unacceptable.
"Hacking is an international problem and China is also a victim. The claims of so-called support for hacking are completely unfounded and have ulterior motives."
On Wednesday, Google said it had "detected and has disrupted" a campaign to take users' passwords and monitor their emails.
"We have notified victims and secured their accounts," said the company. "In addition, we have notified relevant government authorities."
The e-mail scam uses a practice known as "spear phishing" in which specific e-mail users are tricked into divulging their login credentials to a web page that resembles Google's Gmail web service (or which appears related to the target's work) but is in fact run by hackers.
Having obtained the user's e-mail login and password, the hackers then tell Gmail's service to forward incoming e-mail to another account set up by the hacker.
In an advisory message released on Wednesday, Google recommends several steps for users to take to improve the security of Google products:
Enable two-step verification, such as using a mobile phone to which Google sends a second password to enter on sign-in
Use a strong password (mix of letters and numbers, avoiding family names, birth dates etc) for Google that you do not use elsewhere. Here's a video to help.
Enter your password only into a proper sign-in prompt on a https://www.google.com domain.
Check your Gmail settings for suspicious forwarding addresses or delegated accounts
Nigerian Islamist group Boko Haram has told us at the BBC it carried out the series of bombings after President Goodluck Jonathan's inauguration on Sunday.
The worst incident was at an army barracks in the northern city of Bauchi in which at least 14 people died.
A sect spokesman said it was also responsible for killing the brother of the Shehu of Borno, one of Nigeria's most important Islamic leaders.
The sect has been behind numerous recent assassinations in Borno state.
It is opposed to Western education and accuses Nigeria's government of being corrupted by Western ideas.
Clashes in Borno's state capital, Maiduguri, between the Boko Haram and the police in July 2009 left hundreds of people dead, mainly members of the sect.
For the past eight months, sect members have been fighting a guerrilla war in Borno, killing policemen and people they believe were helping the security services in the fight against them.
Sect spokesman Abu Zayd told the BBC's Hausa Service that the group was behind the bombings on Sunday.
''We are [also] the ones responsible for the killing of the junior brother of the Shehu of Borno," he said.
Abba Anas Ibn Umar Garbai was killed by gunmen outside his home in Maiduguri on Monday evening.
The Shehu of Borno is one of Nigeria's most prominent religious figures - second only to the Sultan of Sokoto, the spiritual leader of Nigeria's Muslims.
"As we always say, these traditional institutions are being used to track and hunt us, that is why we attack them," Mr Zayd said.
"We are doing what we are doing to fight injustice, if they stop there satanic ways of doing things and the injustices, we would stop what we are doing.''
Officials say 16 people died in the explosions in Bauchi, Zuba, Zaria, hometown of Vice-President Namadi Sambo, and Maiduguri.
The first attack came only hours after President Jonathan was sworn in for his first full four-year term of office in the capital, Abuja.
Mr Jonathan was promoted from vice-president after northerner Umaru Yar'Adua died in office in 2010.
April's election was largely considered free and fair, but hundreds of people were killed in three days of rioting and reprisal killings in northern towns following the announcement of the result.
Mr Jonathan, a southerner, secured nearly 60% of the vote in the election. His main challenger, northern Muslim and former military ruler Muhammadu Buhari, came a distant second with almost 32%.
Nigeria is divided by rivalry between the predominantly Muslim north and the mainly Christian south, which also have cultural, ethnic and linguistic differences.
Analysts say that Mr Jonathan will have to tackle this north-south rivalry and also the simmering tension in the oil-producing Niger Delta.
To win at the first round, a candidate not only needs the majority of votes cast, but at least 25% of the vote in two-thirds of Nigeria's 36 states. Goodluck Jonathan, of the PDP, reached that threshold in 31 states; runner-up Muhammadu Buhari of the CPC only did so in 16 states.
Nigeria's 160 million people are divided between numerous ethno-linguistic groups and also along religious lines. Broadly, the Hausa-Fulani people based in the north are mostly Muslims. The Yorubas of the south-west are divided between Muslims and Christians, while the Igbos of the south-east and neighbouring groups are mostly Christian or animist. The Middle Belt is home to hundreds of groups with different beliefs, and around Jos there are frequent clashes between Hausa-speaking Muslims and Christian members of the Berom community.
Despite its vast resources, Nigeria ranks among the most unequal countries in the world, according to the UN. The poverty in the north is in stark contrast to the more developed southern states. While in the oil-rich south-east, the residents of Delta and Akwa Ibom complain that all the wealth they generate flows up the pipeline to Abuja and Lagos.
Southern residents tend to have better access to healthcare, as reflected by the greater uptake of vaccines for polio, tuberculosis, tetanus and diphtheria. Some northern groups have in the past boycotted immunisation programmes, saying they are a Western plot to make Muslim women infertile. This led to a recurrence of polio, but the vaccinations have now resumed.
Female literacy is seen as the key to raising living standards for the next generation. For example, a newborn child is far likelier to survive if its mother is well-educated. In Nigeria we see a stark contrast between the mainly Muslim north and the Christian and animist south. In some northern states less than 5% of women can read and write, whereas in some Igbo areas more than 90% are literate.
Nigeria is Africa's biggest oil producer and among the biggest in the world but most of its people subsist on less than $2 a day. The oil is produced in the south-east and some militant groups there want to keep a greater share of the wealth which comes from under their feet. Attacks by militants on oil installations led to a sharp fall in Nigeria's output during the last decade. But in 2010, a government amnesty led thousands of fighters to lay down their weapons.
Syrian President Bashar al-Assad should face trial at a UN court over the "brutal" treatment of his people, Australia's foreign minister says.
Kevin Rudd said incidents such as the alleged torture and murder of a 13-year-old boy by security forces had robbed Mr Assad of any legitimacy.
President Assad invited the boy's family to meet him and promised an inquiry, state television said.
Activists say more than 1,000 people have died in weeks of protests.
The 13-year-old boy, Hamza al-Khatib, has become an icon of the anti-government uprising in Syria, says the BBC's Jim Muir.
Activists say he was detained by security forces and tortured to death, while the authorities insist he was shot dead during a demonstration.
Mr Rudd called it a "brutal act" and accused Mr Assad of taking "large-scale directed action" against his own people.
"I believe it is high time that the Security Council now consider a formal referral of President Assad to the International Criminal Court," said Mr Rudd.
Martyr to both sides
US Secretary of State Hillary Clinton said the boy's death showed the regime was deaf to the voice of its people.
Clinton: "I hope this child did not die in vain but that the Syrian government will end the brutality and begin a transition to real democracy"
"I can only hope that this child did not die in vain but that the Syrian government will end the brutality and begin a transition to real democracy," she said.
Hamza Khatib is being hailed as a martyr, and his picture is now held aloft at demonstrations around the country and abroad.
He is being compared to the Tunisian market-seller Mohamed Bouazizi and Iranian pro-democracy protester Neda Agha Soltan whose deaths galvanised anti-government campaigns.
Hamza is also being called a martyr by the Syrian authorities.
State TV said the teenager's father and family were invited to meet President Assad, and they were quoted as saying he "engulfed us with his kindness and graciousness".
A man who identified himself as Hamza's father said: "The president considered Hamza his own son and was deeply affected."
'Mutilated body'
The boy went missing after a demonstration at an army barracks near Deraa in the south at the end of April.
Activists say he was captured and tortured to death, and that his mutilated body was handed back to his family four weeks later.
The government says he received three fatal gunshot wounds during the protest and died on the spot, but there was a delay in handing over his body because he was not identified.
Syrian state TV aired a programme about the teenager on Tuesday night in which a judge said death was due to "a number of bullet wounds without any indication of torture or beating on the body".
Coroner Akram al-Shaar blamed the state of the body on decomposition, adding: "There are no marks on the surface of the body that show violence, resistance or torture."
Human Rights Watch (HRW) published a report on Wednesday that said "systematic killings and torture by Syrian security forces" in Deraa could qualify as crimes against humanity.
"For more than two months now, Syrian security forces have been killing and torturing their own people with complete impunity," said Sarah Leah Whitson, HRW Middle East director.
"They need to stop - and if they don't, it is the Security Council's responsibility to make sure that the people responsible face justice."
Thousands of Syrian refugees have fled into northern Lebanon bringing with them tales of brutality by Syrian security forces in the town of Tal Kalakh, the BBC's Owen Bennett-Jones reports.
The US is working on a plan to categorise cyber-attacks as acts of war, says the New York Times newspaper.
In future, a US president could consider economic sanctions, cyber-retaliation or a military strike if key US computer systems were attacked, officials have said recently.
The planning was given added urgency by a cyber-attack last month on the defence contractor, Lockheed Martin.
A new report from the Pentagon is due out in a matter of weeks.
"A response to a cyber-incident or attack on the US would not necessarily be a cyber-response. All appropriate options would be on the table," Pentagon spokesman Colonel Dave Lapan told reporters on Tuesday.
'All necessary means'
The Pentagon's planning follows an international strategy statement on cyber-security, issued by the White House on 16 May.
The US would "respond to hostile acts in cyberspace as we would to any other threat to our country", stated the White House in plain terms.
"We reserve the right to use all necessary means - diplomatic, informational, military, and economic - as appropriate and consistent with applicable international law, in order to defend our nation, our allies, our partners and our interests."
The strategy will classify major cyber-attacks as acts of war, paving the way for possible military retaliation, reported The Wall Street Journal after interviewing defence officials.
Sophistication of hackers
One of the difficulties strategists are grappling with is how to track down reliably the cyber-attackers who deliberately obscure the origin of their incursions.
And it is not clear how the Pentagon proposes to deal with cyber-attackers, such as terrorists, who are not acting for a nation state.
The sophistication of hackers and frequency of the attacks came back into focus after an attack on arms-maker Lockheed Martin on 21 May.
Lockheed said the "tenacious" cyber-attack on its network was part of a pattern of attacks on it from around the world.
The US defence department estimates that more than 100 foreign intelligence organizations have attempted to break into American networks.
US military prosecutors have filed new charges against self-described 9/11 mastermind Khalid Sheikh Mohammed and four alleged co-conspirators held at Guantanamo Bay, reports say.
The charges are expected to be formally unveiled later on Tuesday.
All five defendants had previously been charged at Guantanamo over the attacks.
But the charges were set aside as the Obama administration tried to move the trial into US civilian courts, a move which was reversed in April.
Mohammed previously admitted to being responsible "from A to Z" for the attacks in New York and Washington.
Mohammed was captured in Pakistan in March 2003 and sent to the US detention centre in Cuba in 2006.
Ratko Mladic is being flown from Belgrade to a UN tribunal in The Hague, after a Serbian court rejected an appeal against his transfer.
Serbia's justice minister said she had signed the extradition order. After the hearing, the former Bosnian Serb army chief was taken to the airport.
He faces genocide charges over the Bosnian conflict in the 1990s.
His lawyer had argued he was too ill to be tried. But doctors said he was fit enough to be extradited.
The 69-year-old was seized last Thursday in Lazarevo village, north of Belgrade, having been on the run for 16 years.
On Tuesday, a Belgrade court ruled that Gen Mladic was fit enough to be handed over to the International Criminal Tribunal for the former Yugoslavia (ICTY) in The Hague.
Later, a police convoy was seen leaving the court building, raising speculation that the defendant was already on his way.
Serbian Justice Minister Snezana Malovic then announced she had signed the extradition papers and that Gen Mladic was already on the plane.
Omarska concentration camp victim Kamal Pervanic: "My guards were my former teachers"
Earlier on Tuesday, Gen Mladic had been allowed to visit the grave of his daughter Ana, albeit under heavy security.
Ana Mladic committed suicide in 1994 aged 23, reportedly shooting herself with her father's favourite pistol after she read about his alleged crimes in a magazine.
During the 20-minute visit to her grave, Gen Mladic lit a candle and he left a small white bouquet of flowers with a red rose in the middle, said Serbia's deputy war crimes prosecutor, Bruno Vekaric.
Gen Mladic's arrest is considered crucial to Serbia's bid to join the European Union.
His son Darko Mladic said his father had told him he was not responsible for the killings in Srebrenica, committed after Bosnian Serb troops overran the town in July 1995.
The former Yugoslavia was a Socialist state created after German occupation in World War II and a bitter civil war. A federation of six republics, it brought together Serbs, Croats, Bosnian Muslims, Albanians, Slovenes and others under a comparatively relaxed communist regime. Tensions between these groups were successfully suppressed under the leadership of President Tito.
After Tito's death in 1980, tensions re-emerged. Calls for more autonomy within Yugoslavia by nationalist groups led in 1991 to declarations of independence in Croatia and Slovenia. The Serb-dominated Yugoslav army lashed out, first in Slovenia and then in Croatia. Thousands were killed in the latter conflict which was paused in 1992 under a UN-monitored ceasefire.
Bosnia, with a complex mix of Serbs, Muslims and Croats, was next to try for independence. Bosnia's Serbs, backed by Serbs elsewhere in Yugoslavia, resisted. Under leader Radovan Karadzic, they threatened bloodshed if Bosnia's Muslims and Croats - who outnumbered Serbs - broke away. Despite European blessing for the move in a 1992 referendum, war came fast.
Yugoslav army units, withdrawn from Croatia and renamed the Bosnian Serb Army, carved out a huge swathe of Serb-dominated territory. Over a million Bosnian Muslims and Croats were driven from their homes in ethnic cleansing. Serbs suffered too. The capital Sarajevo was besieged and shelled. UN peacekeepers, brought in to quell the fighting, were seen as ineffective.
International peace efforts to stop the war failed, the UN was humiliated and over 100,000 died. The war ended in 1995 after NATO bombed the Bosnian Serbs and Muslim and Croat armies made gains on the ground. A US-brokered peace divided Bosnia into two self-governing entities, a Bosnian Serb republic and a Muslim-Croat federation lightly bound by a central government.
In August 1995 the Croatian army stormed areas in Croatia under Serb control prompting thousands to flee. Soon Croatia and Bosnia were fully independent. Slovenia and Macedonia had already gone. Montenegro left later. In 1999 Kosovo's ethnic Albanians fought Serbs in another brutal war to gain independence. Serbia ended the conflict beaten, battered and alone.
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Following the arrest of former Bosnian Serb leader Radovan Karadzic in 2008, Gen Mladic became the most prominent Bosnian war crimes suspect still at large.
He was indicted by the UN war crimes tribunal in The Hague in 1995 for genocide over Srebrenica - the worst single atrocity in Europe since World War II - and other alleged crimes.
Having lived freely in the Serbian capital, Belgrade, he disappeared after the arrest of former Yugoslav President Slobodan Milosevic in 2001.
On Sunday, thousands of people rallied in Belgrade against his arrest, hailing the general as a Serbian national hero and decrying the pro-Western government of President Boris Tadic for arresting him.
Gen Martin Dempsey has been nominated as the new chairman of the joint chiefs of staff, the highest US military post.
A veteran of the Iraq war, Army Chief of Staff Dempsey will succeed Navy Admiral Mike Mullen as the president's top military adviser on 30 September.
President Obama made the announcement in the White House garden but it is subject to Senate approval.
Obama has also named Adm James Winnefeld, the head of the US Northern Command, to serve as vice chairman.
Gen Ray Odierno was nominated to replace Gen Dempsey as the Army's chief of staff.
In naming Gen Dempsey, the president described him as "one of our nation's most respected and combat-tested generals".
If confirmed by the Senate, the general would be the top adviser as the scaling down of US forces in Iraq continues and troops in Afghanistan begin to come home later this year.
The BBC's Jonny Dymond, in Washington, says General Dempsey is understood to be wary of hi-tech projections of future military needs; his experience in counter insurgency has led him to place a premium on boots on the ground.
But his biggest challenge may be more prosaic, our correspondent adds. Defence consumes around 20% of the federal budget and from across the political spectrum there is a demand for cuts.
Time in combat
General Dempsey would be involved in establishing priorities for cutting the defence budget, working with the incoming Defence Secretary Leon Panetta, an appointment that also requires confirmation from the Senate.
Dempsey only just began his four-year tenure as Army chief of staff in April, but he has extensive experience.
His time in combat includes serving as the commander of the 1st Armoured Division in Baghdad in 2003 and helping to train Iraqi security forces in another tour.
He also served as acting commander of the US Central Command, overseeing US military operations in the Middle East, Persian Gulf and Central Asia.
Defence Secretary Robert Gates, who retires this year, praised all three appointments.
He said: "They possess the right mix of intellectual heft, moral courage, and strategic vision required to provide sound and candid advice to the president and his national security team."
The Joint Chiefs of Staff (JCS) is based at the Pentagon in Virginia and advises the secretary of defence, the Homeland Security Council, the National Security Council and the president on military matters.
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Mapping the divides
Refugees' tales of brutality
Indonesia defiant in cattle row
