Passengers queue up at the Malaysia Airlines ticketing booth at the Kuala Lumpur International Airport in Sepang.
Separatist leader Aleksander Borodai blamed the downing of a Malaysian passenger airliner in eastern Ukraine on the country's government forces.
"Apparently, it's a passenger airliner indeed, truly shot down by the Ukrainian Air Force," Borodai told Russia's state-run Rossiya 24 TV broadcaster.
Ukraine's president, however, denied his country's armed forces had shot any airborne targets.
"We do not exclude that this plane was shot down, and we stress that the Armed Forces of Ukraine did not take action against any airborne targets," President Petro Poroshenko said on Thursday.
Poroshenko said "we are sure that those who are guilty in this tragedy will be held responsible."