In pictures: Investigations continue into Malaysian Airlines flight MH17

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  Inspectors arrive for investigations at the crash site of Boeing 777, Malaysia Airlines flight MH17 airplane, which crashed during flying over the eastern Ukraine region near Donetsk, Ukraine. EPA/ANASTASIA VLASOVA

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  Two workers carry the remains of a passenger at the main crash site of the Boeing 777 Malaysia Airlines flight MH17, which crashed during flying over the eastern Ukraine region, some 100 Km east from Donetsk, Ukraine. EPA/ROBERT GHEMENT

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  College students gather around candles forming the shape of an airplane, during a candlelight vigil for victims of the downed Malaysia Airlines Flight MH17, at a university in Yangzhou, Jiangsu province on Saturday. Ukraine accused Russia and pro-Moscow rebels on Saturday of destroying evidence of "international crimes" as guerrillas and foreign observers faced off over access to the wreckage of the downed Malaysian airliner. REUTERS/Stringer

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  A young girl places a bouquet of flowers in commemoration of the victims of Malaysia Airlines MH17 plane accident in eastern Ukraine in front of the Dutch embassy in Kiev. EPA/ROMAN PILIPEY

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  Ukrainian rescue workers carry the body of a victim on a stretcher through a wheat field at the site of the crash of a Malaysia Airlines plane carrying 298 people from Amsterdam to Kuala Lumpur in Grabove, in rebel-held east Ukraine. Outraged world leaders have demanded Russia's immediate cooperation in a prompt and independent probe into the shooting down on July 17 of flight MH17 with 298 people on board. AFP PHOTO / DOMINIQUE FAGET

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  Alexander Hug (second from the right), Deputy Chief Monitor of the Organisation for Cooperation and Security in Europe's Special Monitoring Mission to Ukraine, and members of his team wait to visit the site of the crash of a Malaysian airliner carrying 298 people from Amsterdam to Kuala Lumpur in Grabove, in rebel-held east Ukraine. AFP PHOTO / DOMINIQUE FAGET

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  An armed rebel soldier guards the main crash site of the Boeing 777 Malaysia Airlines flight MH17. EPA/ROBERT GHEMENT

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  Journalists document the passengers' belongings at the main crash site of the Boeing 777 Malaysia Airlines flight MH17. EPA/ROBERT GHEMENT

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  Malaysia's Transport Minister Liow Tiong Lai speaks during a news conference at a hotel near the Kuala Lumpur International Airport in Sepang. Liow said on Saturday he believed Russia was doing its best to ensure a safe route to the site of the downed Malaysia Airlines Flight MH17 and appealed to the world to help ensure bodies can be retrieved quickly. REUTERS/Edgar Su

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  Local residents walk among the wreckage at the site of the crash of a Malaysia Airlines plane carrying 298 people from Amsterdam to Kuala Lumpur in Grabove, in rebel-held east Ukraine. AFP PHOTO/ ALEXANDER KHUDOTEPLY

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  A group of coal miners sweeps a wheat field looking for remnants of Malaysia Airlines flight MH 17 on Saturday in Grabovo, Ukraine. Malaysia Airlines flight MH17 was travelling from Amsterdam to Kuala Lumpur when it crashed killing all 298 on board including 80 children. The aircraft was allegedly shot down by a missile and investigations continue over the perpetrators of the attack. Brendan Hoffman/Getty Images

The US president Barack Obama demanded an immediate ceasefire in eastern Ukraine to allow for a credible investigation of a downed Malaysian jetliner, and confirmed that the plane was hit with a missile fired from territory held by pro-Russia rebels.

So far, no official investigative body has been given charge of the crash site in rural eastern Ukraine, which remained unsecured on Friday. The Organization for Security and Cooperation in Europe sent a team of monitors to the site, but they later reported only limited access to the wreckage.