People wait in line to sign a condolence book next to a sea of candles left by mourners outside Warsaw's presidential palace

Poland's acting president is to review travel rules for military officials after the president and other top officials were killed in a plane crash.

Bronislaw Komorowski announced the move as mourning continued for the 96 people killed when the jet crashed in fog while trying to land in western Russia.

President Lech Kaczynski's body is to lie in state in a closed coffin.

Questions are being asked about why the jet's pilots ignored advice to divert to another airport because of the fog.

Russia flew the bodies of victims, many of them believed to be disfigured beyond recognition, to morgues in Moscow where only about a quarter of them have been identified.

The body of the president's wife, Maria Kaczynska, has been identified and is to due to be returned to Poland on Tuesday.

There is no precedent for a dual funeral involving a head of state and his first lady, but a spokesman for the president's office said a joint funeral would be held once the bodies of all those killed had been repatriated.

Those killed had been due to attend a memorial for the Polish victims of the World War II massacre by Soviet secret police at Katyn in the Smolensk region.

Commentators in Poland have stressed the irony that so many senior figures were killed making a visit to commemorate victims of a massacre which targeted the elite of Poland's officer corps.

'Advised against landing'

The Soviet-built Tu-154 airliner clipped tree-tops as it tried to land at a former air base north of the city of Smolensk on Saturday morning.

SENIOR FIGURES KILLED National leaders: President Lech Kaczynski and wife Maria Former President-in-exile Ryszard Kaczorowski Top civil servant: Slawomir Skrzypek National Bank of Poland chairman Other politicians: Wladyslaw Stasiak chief of the president's chancellery Aleksander Szczyglo chief of the National Security Office Jerzy Szmajdzinski deputy speaker of the lower house Andrzej Kremer Foreign Ministry's undersecretary of state Stanislaw Komorowski deputy minister of national defence Przemyslaw Gosiewski Law and Justice party deputy chair Military figures: Franciszek Gagor chief of the general staff Andrzej Blasik head of the air force Andrzej Karweta head of the navy Tadeusz Buk land forces commander Aleksander Szczyglo head of the National Security Office Cultural figures: Andrzej Przewoznik head of Poland's Council for the Protection of Struggle and Martyrdom Sites Tomasz Merta chief historical conservator Pilot error in Polish air crash? In pictures: Nations mourn Russia-Poland thaw from tragedy

Polish Prosecutor General Andrzej Seremet said that Polish investigators had talked to the flight controller and flight supervisor and concluded that there had been "no conditions for landing".

"The tower was advising against the landing," he said.

Polish investigators, he said, had not yet listened to the cockpit conversations recorded on the plane's recovered black boxes but would do so to see if there had been "any suggestions made to the pilots" from other people aboard the plane.

There has been speculation the pilot and co-pilot, who were both aged 36, were under pressure not to delay the landing.

Sergei Ivanov, Russia's first deputy prime minister, said the black boxes were "absolutely functional and recorded absolutely all the information, sound as well as parametric [information], till the moment of crash".

"It is reliably confirmed that warning of the unfavourable weather conditions at the North airport and recommendations to go to a reserve airport were not only transmitted but received by the crew of the plane," he added.

Mr Seremet said the remains of 87 people had been found so far and he hoped the rest would be retrieved when the crash debris was lifted with heavy machinery.

Special session

A special joint session of the Polish parliament has been called for Tuesday to debate the disaster whose victims included MPs.

It is believed the funerals could be held this weekend.

The crash shocked many Russians as well, the BBC's Duncan Kennedy reports from Warsaw.

President Dmitry Medvedev and Prime Minister Vladimir Putin have devoted much time and effort to dealing with the aftermath of the crash, he adds, and Monday was a day of mourning in Russia.

The country was "suffering and grieving together with the Poles", Mr Putin told a cabinet meeting.

Russia's handling of the tragedy has been widely appreciated by many in Poland, though others suggest the thaw in relations may not last, our correspondent says.

At least 130 relatives have been flown to the Russian capital in the hope of helping forensic scientists to identify their loved ones' remains. They are being aided by Polish and Russian psychologists.

"We all had to fulfil this difficult duty," said Rafal Dobrzeniecki, whose fiancee's father died in the crash. "I never had the chance to call him my dear father-in-law, he will always stay in my memory."

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Israeli troops would have the power to deport people within 72 hours

Israel is set to impose a military order which rights groups say could see tens of thousands of Palestinians deported from the occupied West Bank.

The order, which comes into force on Tuesday, could have "severe ramifications" for people in the West Bank, human rights groups say.

It classifies people without the right Israeli paperwork as "infiltrators".

Many people in the West Bank have ID cards from neighbouring countries, or papers that list Gaza as their home.

Many others are married to other Palestinians who at one time lived in refugee camps in neighbouring Jordan, Egypt, Syria or Lebanon, and may not have Israeli-approved ID cards.

The Israeli military says that existing orders already allow for the deportation of West Bank Palestinians deemed by Israel to be there illegally, and the new order adds a layer of judicial oversight over deportation procedures.

'Permit'

The wording of the order, known as the Order Regarding Prevention of Infiltration, has been amended from when it was originally drawn up in 1969.

The definition of "infiltrator" was then: "A person who entered the area knowingly and unlawfully after having been present in the east bank of the Jordan, Syria, Egypt or Lebanon following the effective date (of the order being given)."

These military orders belong in an apartheid state. Extensive in scope, they make it infinitely easier for Israel to imprison and expel Palestinians from the West Bank Saeb Erekat Chief Palestinian negotiator

Under the new order this would be changed to: "Infiltrator - a person who entered the area unlawfully following the effective date, or a person who is present in the area and does not lawfully hold a permit".

"The orders are worded so broadly such as theoretically allowing the military to empty the West Bank of almost all its Palestinian inhabitants," a letter written by human rights organisation HaMoked and signed by 10 other groups to Defence Minister Ehud Barak said.

72 Hours

But the IDF said Israel was within its rights to restrict people entering the West Bank illegally, and the order was being amended to allow what it called "judicial oversight" in cases of accused "illegal sojourners".

Under the military order, deportations from the West Bank can be carried out within 72 hours.

Suspected "infiltrators" could also be jailed for up to seven years under the new orders. Anyone being removed might also have to pay for the cost of their own deportation, the order says.

This is a pre-existing order which was corrected to assure judicial oversight of the extradition process IDF statement

The group of 10 Human rights groups in Israel who condemned the new orders included HaMoked - who uncovered the amendments to the order - Betselem, the Association for Civil Rights in Israel, and Rabbis for Human rights.

Many Palestinians in the West Bank hold ID cards from neighbouring countries that Israel classifies as its enemies, because they have returned from refugee camps there over the last few years. Some have no identity cards and are technically "stateless persons".

The order could also apply to people from foreign countries friendly to Israel, like the US, UK and Europe.

Sarit Michaeli, director of Betselem, says the order would also undermine the Palestinian Authority, led by Palestinian leader Mahmoud Abbas.

"That such a sweeping order, such a draconian order, was allowed to pass without any amount of public debate or proper advertisement, an order which could effect every Palestinian, we intend to fight it in the courts," she told the BBC.

Chief Palestinian negotiator Saeb Erekat said the new measures "belong in an apartheid state".

"Extensive in scope, they make it infinitely easier for Israel to imprison and expel Palestinians from the West Bank," he said in a statement.

'Pre-existing order'

The IDF said said in a statement that all the requisite notices of the change to the orders had been given.

"The IDF is ready to implement the order, which is not intended to apply to Israelis, but to illegal sojourners in Judea and Samaria [the West Bank]. This is a pre-existing order which was corrected to assure judicial oversight of the extradition process," a statement from the IDF said.

Correspondents say there is great uncertainty among Palestinians about what the new military order means and to what extent it will be enforced.

Confusion about what is meant by a "permit" has lead human rights groups to fear the order could leave many more people vulnerable to deportation than in the past, but it seems their main concern is over two groups who were already at risk.

The first are those whose identity cards show them as Gazans, but who have been living in the West Bank, and children they have had while living there. Israel does not allow them to change their status from Gaza to the West Bank, despite the fact that under the Oslo Accords, Gaza and the West Bank were to be considered a single entity.

The second group are spouses of Palestinians, who entered on limited-time visas and have stayed, but not been granted official status.

Both groups could previously have been deported if discovered - for example while passing through a checkpoint in the West Bank - but the possible jail sentences are now tougher.

Human rights groups say Israel has frozen changes to ID cards for many people in both these groups since 2000, leading to the situation where tens of thousands of people are living in the West Bank without the necessary official permission to stay.

Close to 500,000 Jews live in more than 100 settlements built since Israel's 1967 occupation of the West Bank, including East Jerusalem. The settlements are illegal under international law, though Israel disputes this.

There are around 2.5 million Palestinians living in the West Bank.

Ibrahim Babangida lost power after he annulled 1993 elections

Nigerian former military leader Gen Ibrahim Babangida will run in the 2011 presidential poll, his spokesman says.

He told the BBC that Gen Babangida will seek the nomination of the ruling People's Democratic Party (PDP).

Gen Babangida took power in 1985 in a bloodless coup, but was forced to step down in 1993 when he annulled elections generally considered to be fair.

He had declared he wanted the PDP nomination for 2007 elections, but later withdrew his candidacy.

The PDP has said that its presidential candidate will be from the mainly Muslim north, which includes Gen Babangida - or IBB as he is known in Nigeria.

IBRAHIM BABANGIDA Senior officer during Nigeria's civil war, 1967-70 Participated in three coups - becoming leader in 1985 Survived a 1990 coup attempt Resigned presidency in 1993 after nationwide strikes and protests Nicknamed "Maradona" for his clever political dribbling skills Gave himself the title "Evil genius"

President Umaru Yar'Adua has not been seen in public since November 2009 because of his ill-health and is considered unlikely to seek re-election.

Acting President Goodluck Jonathan is from the south and so would not be a candidate under the PDP's policy of alternating power between north and south, with each region having two terms.

Correspondents say IBB, an extremely wealthy northern Muslim, is a polarising figure in Nigerian politics - a man who either inspires great admiration or intense dislike.

He enjoys the goodwill of those he empowered during his eight-year military rule - people who now hold influential positions in business and politics, and could help his presidential bid.

However, some observers argue that under IBB's rule corruption became endemic in Nigeria, the economy deteriorated and democracy suffered.

His promises to hand over to civilian rule came to nothing and his annulment of the 1993 election allowed military strongman Gen Sani Abacha to assume power.

Gen Babangida pulled out of the 2007 election when then President Olusegun Obasanjo instead declared his support for Mr Yar'Adua's bid for the presidency.

Mr Yanukovych met Mr Obama ahead of Monday's nuclear security summit

Ukraine has agreed to eliminate its stockpile of weapons-grade nuclear material, the US says, as a nuclear security summit opens in Washington.

The White House said Ukraine would by 2012 get rid of enough highly enriched uranium to build "several weapons".

Leaders from 47 countries are taking part in the summit, called by President Barack Obama.

Before the two-day meeting, he said a clear message needed to be sent to Iran over its nuclear ambitions.

White House spokesman Scott Gibbs said: "Today Ukraine announced a landmark decision to get rid of all of its stockpile of highly enriched uranium by the time of the next nuclear security summit in 2012.

"This is something that the United States has tried to make happen for more than 10 years. The material is enough to construct several nuclear weapons."

Al-Qaeda threat?

This summit is all about securing stocks of fissile material - highly enriched uranium and plutonium - that could potentially be used by terrorists to build a nuclear bomb, says the BBC's diplomatic correspondent, Jonathan Marcus, in Washington.

He says the timing of announcing Ukraine's decision may have been choreographed, but it is just the sort of news Mr Obama wants to hear as he launches the summit.

This is an unprecedented gathering - Mr Obama will hope for an unprecedented outcome Jonathan Marcus BBC diplomatic correspondent Obama's ambitious summit Could terrorists get the bomb?

US officials said that Ukraine has sufficient highly-enriched uranium for several nuclear weapons. This will be removed with some technical and financial help from the United States.

Ukraine's agreement sets a precedent that Mr Obama would like other countries to follow, says our correspondent.

It is estimated there are around 1,600 tonnes of highly enriched uranium in the world - the type used in nuclear weapons.

Experts agree that virtually all of it is held by the acknowledged nuclear-weapons states, most of it in Russia.

There are also about 500 tonnes of the other key ingredient of a nuclear weapon - plutonium.

In total, that is enough to make 120,000 nuclear weapons.

Much international, largely US-funded, effort has attempted to clamp down on the threat of nuclear leakage from Russia in particular, but it remains a concern.

Mr Obama has also highlighted the danger of groups like al-Qaeda getting hold of nuclear devices.

New nuclear policy

Before opening the summit, President Obama held meetings with a handful of international leaders, including Chinese President Hu Jintao, with whom officials said he discussed the prospects of sanctions on Iran.

The White House said in a statement that he had also discussed Iran with Malaysian Prime Minister Najib Razak.

"The two leaders agreed on the need for the international community to send a clear signal to Iran that while it has the right to develop peaceful uses of nuclear energy, Iran should not use this right to develop nuclear weapons capability," said the statement.

Among those attending the summit are Israel, India and Pakistan - three nations that have not signed the non-proliferation treaty.

Neither North Korea nor Iran, two states with disputed nuclear ambitions, have been invited. The two countries are viewed by the US as violators of the non-proliferation agreement.

Syria was also left off the invitation list because the US believes Damascus has nuclear ambitions, according to the Associated Press news agency.

Israel is being represented at the summit only by a deputy prime minister, amid reports that its government is worried that Turkey and Egypt might use the occasion to raise the issue of its nuclear arsenal.

Last week, the US and Russia signed a new Strategic Arms Reduction Treaty, reducing each country's deployed nuclear arsenal to 1,550 weapons.

Earlier in the week, Mr Obama approved a new nuclear policy for the US, saying he planned to cut the nuclear arsenal, refrain from nuclear tests and not use nuclear weapons against countries that did not have them.