An Azerbaijani airliner carrying 67 people crashed in southwestern Kazakhstan on Wednesday, killing at least 38 who were on board, according to Kazakh authorities. In a sprawling rescue operation, 29 survivors including two children were pulled from the wreckage near the city of Aktau,

Even as a probe was starting of the crash of an Azerbaijan Airlines airliner in Kazakhstan, speculation was mounting about why the plane went down.

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.