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Thousands of pro-Russian supporters have gathered for a rally in Lenin Square, Donetsk.
Interpol has said at least two passports, recorded as lost or stolen on its database, were used by passengers on board a missing Malaysia Airlines flight.
The agency says no checks of its database had been made by any country on an Austrian and an Italian passport between the time that they were stolen and the departure of the flight.
"Whilst it is too soon to speculate about any connection between these stolen passports and the missing plane, it is clearly of great concern that any passenger was able to board an international flight using a stolen passport listed in Interpol's databases," Ronald Noble, of Interpol, said.
"It may be that some people could steal my passport and I think my passport maybe nobody can use it again because when I went back to Italy I talked with police, Italian police, to lock my last passport and so nobody can use it."
A passport stolen from Italian Luigi Maraldi is understood to have been used to board the missing Malaysian Airlines flight.
He told reporters: "It may be that some people could steal my passport and I think my passport maybe nobody can use it again because when I went back to Italy I talked with police, Italian police, to lock my last passport and so nobody can use it."
ITV News' Europe Correspondent Emma Murphy is in the Ukrainian city of Donetsk:
At least 5000 pro Russia supporters swamping Lenin sq and main roads in #donetsk. Doesn't fit with klitschko's claim they're "tourists"
Protestor laughs when I tell him Klitschko claimed they weren't local. "There's no enough buses or planes to get us here in these numbers"
Tiny pro Ukraine gathering up the road. Inpart an indication of eastern position but certainly a sign of how threatened they feel.
Nick Clegg has aimed fire at Nigel Farage and Ukip for their "politics of blame" in his closing speech at the Liberal Democrats' spring conference in York.
As some polls indicate eurosceptic Ukip may overtake the Lib Dems in May's European elections, Clegg said: "Do you want Britain in or out [of the EU]? That's the real question in May."
Many of us will have a perfect spring day with unbroken, clear blue skies and sunshine.
More cloud will remain across the north-west with dull, damp conditions for Scotland and Northern Ireland - the rain pepping up later.
Away from the cloud in the north-west, a remarkably mild climate for the time of year and people will be feeling warm in the south, with temperatures peaking at 17-18C inland - and possibly 19C. Coasts will be prone to a cool sea breeze.
Pro-Ukrainian rallies are being held in Simferopol - the capital of Crimea.
Yesterday the first unit of the pro-Russian Military Forces of the Autonomous Republic of Crimea was sworn in at a public ceremony in the city.
Searches are continuing after a Malaysian Airlines Boeing 777 'disappeared' en route to Beijing. The flight that left Kuala Lumpur on Saturday was carrying 239 people.
Authorities are investigating two passengers on board the flight, who are believed to have been travelling on forged passports.
As North Korea heads to the polls, pictures have emerged of jubilant celebrations in the capital, Pyongyang.
Dressed in military uniform, large crowds are seen dancing to lively brass band music.
Today sees the first election in North Korea since 2009 and the first since leader Kim Jong-un came to power.
Despite celebrations across the country, the elections are widely regarded to be for show alone.
The ballot papers for each district contain only one name: the one endorsed by the ruling party.
Ukrainian Prime Minister Arseny Yatseniuk has said he will go to the US this week to discuss the standoff with Russia over Ukraine's southern region of Crimea.
"I am going to the United states to hold top-level meetings on resolving the situation unfolding in our bilateral and multilateral relations," Yatseniuk said.
The three-year-old son of a passenger travelling on the missing Malaysian Airlines aircraft bound for Beijing has been asking "When will Daddy Skype?"
Danika Weeks' husband Paul was on board the plane from Kuala Lumpur when it disappeared off radar on Saturday.
From Perth, Australia, she told reporters she was "taking it minute by minute" as she waited for news of her husband.