A research analyst at the professional forum the Royal United Services Institute said it was possible that the Malaysia Airlines plane could have been brought down by a surface-to-air missile, which he believed would have been flying at 33,000 feet.
Justin Bronk said: "Unfortunately it is possible.
"There have been unconfirmed reports in the past few days of a system called SA-11, which Russia names 'Buk'. It has been seen around Donetsk, and that is a much heavier system. It looks like a tank with four large missiles on top and it is capable of shooting down an airliner at that sort of altitude."
Thousands of online users have taken to social media to call for the victims of the Malaysian airliner crash to be returned to loved ones.
United States intelligence officials admitted that they do not know who fired the surface-to-air missile that downed flight MH17.
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