On Christmas Day, a plane traveling from Baku, Azerbaijan, to Grozny, Russia, crashed in Kazakhstan, killing over half of its passengers. Theories abound regarding why the plane made an emergency landing near the Kazakhstani city of Aktau.

An Azerbaijani airliner has crashed in Kazakhstan after being diverted, killing 38 of 67 people on board. Some experts alleged that the plane went down after being hit by Russian air defense systems. Some things to know about the crash and the speculation about a possible cause:

One of the victims of a deadly plane crash in Kazakhstan was buried on Friday. Ramazan Filiev, 26, was one of 38 people killed when Azerbaijan Airlines' Embraer 190 was diverted for reasons still unclear on Wednesday and crashed while making an attempt to land in Aktau in Kazakhstan.