Also the way the debris were scattered on the ground suggests an explosion. This also correlates with what they said about no mayday call from the aircraft. It was taken down or it was a collission with a drone or something like that.
Lemme be blunt. Some people believe that since this happened at a time military tensions between Iran and the US were escalating, the plane could have been taken down mistakenly by a trigger-happy general as a false positive.