LONDON - To figure out why a Malaysian jetliner fell from the sky, investigators will use the wreckage of any missile found to determine where it came from and who fired it, experts said Friday. That may be easier said than done in the middle of a war zone.
Investigators face formidable obstacles in deciphering a disaster scene spread over 20 square kilometers (eight square miles) of contested ground in eastern Ukraine - amid a conflict in which both sides have interests that may outweigh a desire to uncover the truth.
"We are in a country that is at war, and that is in a war of communication," aviation analyst Gerard Feldzer said in Paris. "Everyone is pushing a pawn."
All 283 passengers and 15 crew members aboard the Amsterdam-to-Kuala Lumpur flight were killed in Thursday's crash. U.S authorities and aviation experts say the Boeing 777 was likely brought down by a ground-to-air missile, but so far there is no proof of who fired it. Ukraine and the insurgents blame each other.
The U.N. Security Council called Friday for "a full, thorough and independent international investigation" into the downing of the plane, but that is a complicated proposition.
Under international civil aviation rules, Ukraine should take the lead in investigating an airline accident on its territory. Anton Gerashenko, an adviser to Ukraine's interior minister, told The Associated Press that the investigation would be carried out by the Interior Ministry and the Security Services of Ukraine, who would work alongside international observers.
It was unclear what access either group would have to the crash site.
The Organization for Security and Cooperation in Europe sent a team of international monitors to the site, a swathe of smoldering wreckage and body parts near Ukraine's border with Russia, but they later reported only limited access to the wreckage.
European Union officials said Friday that Ukraine has first claim on the plane's two black boxes - a flight data recorder and a cockpit voice recorder - which could contain valuable clues about what happened in the moments before the crash.
An assistant to the insurgency's military commander said Friday that rebels had recovered multiple devices from the wreckage and were considering what to do with them, raising fears they could be headed to Moscow. But Russian Foreign Minister Sergey Lavrov said Russia had no intention of getting hold of the boxes, which he said should be given to the relevant international organizations. And insurgent leader Aleksandr Borodai later contradicted his colleague and said the rebels don't have them anyway.
Defense experts said the plane was likely shot down by a missile fired from a Buk system, Soviet-era equipment that is in the arsenals of both Russia and Ukraine. There was no previous evidence of separatist rebels using such missiles, though a rebel Twitter account boasted last month about seizing a Buk system from Ukrainian forces, and AP journalists saw such a system hours before the crash Thursday in rebel-held territory.
Feldzer, the air-accident expert, said investigators' goal would be to "find the debris of the missile in question and determine the trajectory." Once investigators reach the site, they should be able to discover whether the plane was hit by one or more missiles, and the size of the missile system involved.
But, he said, "that won't determine who did it," unless investigators can find a satellite photo or radar records of the missile.
Justin Bronk, a research analyst at the Royal United Services Institute, a London-based military think tank, said the United States has sophisticated military satellites capable of detecting a missile launch, but might be unwilling to share its images in order to protect its secret surveillance capabilities.
"They will probably try to liaise with civilian satellite operators to see if there are any who also picked up the trail on infra-red sensors so that they can publicly release that data," he said.
The crash site is vast, and experts said rebel fighters may have removed key evidence in the chaotic hours after the disaster, as they joined emergency workers and local coal miners to comb the wreckage and recover the bodies.
Charles Heyman, editor of "Armed Forces of the EU," said missile casings could help establish who had supplied the weapons that brought down the plane. But he said it was likely that the rebels - if they fired the missile - would have removed any missile-casing debris from the scene.
Heyman said the missile launcher would bear ID numbers that could establish whether it was recently supplied by Russia or came from Ukrainian forces.
But he said if rebels mistakenly targeted a commercial airliner, thinking it was a Ukrainian military plane, they may have subsequently fled and taken the missile launcher into Russia.
The Ukrainian Interior Ministry released video purporting to show exactly that: a truck carrying a Buk missile launcher with one of its four missiles apparently missing, rolling toward the Russian border. The ministry said the footage was captured by a police surveillance squad at dawn Friday. There was no way to independently verify that claim.
"If I was the rebel chief of staff, I'd have had it taken away, dismantled and blown up," Heyman said, "and then bury the pieces in a swamp."
Mills reported from Moscow. Associated Press writers Matthew Knight, Danica Kirka and Gregory Katz in London, Angela Charlton in Paris and John-Thor Dahlburg in Brussels contributed to this report.
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