On board crashed into the Mediterranean Sea aircraft fire alarm.

As it was established professionals involved in the investigation of the tragedy, a few moments before the plane disappeared from the radar of air traffic controllers, in one of the toilets airliner Airbus A320 triggered alarm, caused by According to experts, occurred by smoke.

Experts believe that this information can indicate which occurred on board the aircraft explosion, however, we are not talking about the explosion of high power, but rather on the detonation of a small explosive device that could damage the aircraft.

Experts believe that further investigation will establish more precise circumstances of this tragedy.