There are early indications that a Russian anti-aircraft system may have struck the Azerbaijan Airlines plane that crashed in Kazakhstan, killing dozens, a U.S. official told ABC News. If these indications prove true,

The Azerbaijan Airlines plane flew hundreds of miles off its scheduled route from Baku to Grozny, and crashed on the eastern shore of the Caspian Sea. Russia's aviation watchdog said a bird strike might have been the cause.

This report contains content some people may find distressingThis social media video shows the moment Azerbaijan Airlines flight J2-8243 crashed in Kazakhstan on Wednesday, killing 38 people.Four sources with knowledge of the preliminary findings of Azerbaijan's investigation into the disaster told Reuters that Russian air defenses downed the passenger jet,