Looking at the video and comparing this to videos of UAV's being shot down with Stinger shoulder mounted surface to air missiles it looks very close to identica

Looking at the video and comparing this to videos of UAV's being shot down with Stinger shoulder mounted surface to air missiles it looks very close to identical. I don't think this was a big missile system like the Patriot or anything. Airlines have checklists and back-n-forth with air traffic control to set their transponder and any air traffic control worth anything would be keeping track of any heavy aircraft leaving their airports which there are reports that no call of trouble was mentioned by the airliner so that means they've already reviewed the ATC tapes. It could have been an abnormally nervous missile platoon in possession of stingers (or similar) told to be on the alert for air to ground attacks and maybe something spooked them or they were targeting the airliner like others have mentioned and someone pulled the trigger unintentionally.