T hursday is an official day of mourning in Azerbaijan as an investigation is underway to determine what caused an airplane carrying 67 passengers to crash on Christmas Day in Kazakhstan, killing 38 and leaving at least 29 survivors. Video posted by CNN shows the plane crash-landing, exploding into a fireball and plumes of black smoke.

Survivors of the Azerbaijan Airlines plane that crashed in Kazakhstan reported hearing thuds and explosions from outside the aircraft during the flight, as the cause of the deadly catastrophe remains under investigation.

Azerbaijan's president accused Russia of trying to cover up its role in a plane crash that killed 38 people. Preliminary results of Azerbaijan’s investigation into the crash indicated that a missile from a Russian air-defense system hit the aircraft.

Azerbaijan demands Russia take responsibility for downing AZAL plane, as Moscow promises to punish those responsible.