Five Iraqi troops were killed Thursday when their helicopter crashed on a “combat mission” north of Baghdad, the military said, as a security source confirmed it had been hit by ground fire.

The helicopter came down near Amerli in Salaheddin province, the military said, in an area where Iraqi troops have carried out repeated operations against suspected sleeper cells of the Islamic State group.

Video footage sent to journalists in Baghdad showed firefighters attempting to put out a blaze in the wreckage of the aircraft.