Malaysian plane shot down in Ukraine: What happened?

Updated 12:02 PM EDT, Sat July 19, 2014

Story highlights

NEW: Donetsk rebel official: Plane shot down, but not by us

Malaysian official says the crash site's integrity has been compromised

President Obama says evidence points to a missile strike by pro-Russian rebels

Russia could face increasing international isolation and tougher sanctions

(CNN) —  

It’s an international air disaster in a war zone – a commercial flight with almost 300 people on board shot down in eastern Ukraine.

As new details emerge, here is a look at basic questions about the tragedy:

Was the plane shot down?

All evidence so far says yes.