Looks like Russians fighting in or near the Ukrainian-Russian border near Donetsk shot down a Malaysian passenger airliner with nearly 300 souls on board using one of the upgraded surface-to-air (SAM) missiles that have recently been introduced in the fighting there by Russia.
The YouTube video below of a plane shot down in East Ukraine was posted just before news of this story broke. This is footage of the plume of smoke from the airliner crashing into the ground:
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