After an Azerbaijan Airlines jet crashed in Kazakhstan, speculation mounted about why the plane went down and whether possible Russian air defense action may have played a role.

Investigators are looking into whether Russian anti-aircraft defenses may have played a role in the deadly plane crash in Kazakhstan. Many questions remain about why the plane was diverted and what led to the crash that killed dozens.

Thirty-eight of 67 onboard flight from Baku to the Chechen city Grozny believed to have been killed. Russian authorities cite bird strike.