Mobile phone footage circulating online appeared to show the Azerbaijani Airlines plane making a steep descent before slamming into the ground in a fireball in western Kazakhstan.

The cause of the Azerbaijan Airlines tragedy is under investigation, but the company is crediting “the crew's valiant dedication to their duties until the last moment”

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