An engineer after the attack helicopter after it was ordered to return to base forgot to inspect its weapon station before releasing the 30 mm caliber shell. Instead, the engineer immediately released the trigger, the source close the ministry told RBC.

“If everything had been done according to instructions, the projectile would have just dropped next to the aircraft, but here it stayed in the barrel. As a result, there was a shot that hit a storage facility,” the source said.

A warehouse wall was partially damaged and there were no casualties in the second incident, according to the source.

A special commission comprising Defense Ministry and aviation industry officials was formed to ascertain the causes of the mishap and identify those responsible, RBC reported.