Came across a video of incident, which is now on BBC news website.You need to scroll down to see the video.
Quality is poor, but it looks very like the aircraft was shot down.
The video begins with the aircraft in a steep nose down attitude, then shortly after a large piece detaches from the fuselage.
After the aircraft crashes and explodes, the camera pans left, you can clearly see a puff of dark smoke,hanging in the sky,which looks like where a missile of some sort has hit the aircraft.
https://www.bbc.co.uk/news/live/world-u ... a-68079336