The plane, which crashed in Kazakhstan this week, went down “due to external physical and technical interference,” according to the investigation’s preliminary findings.

Experts say evidence in the Azerbaijan Airlines plane crash in Kazakhstan points to a possible midair explosion, not an encounter with a flock of birds.

Azerbaijan Airlines said Friday the passenger jet that crashed in Kazakhstan on Christmas Day experienced “physical and technical external interference,” according to an early investigation. At least 38 of the 67 people on board the plane were killed in the crash,