KHARTOUM, Sudan: The teenage boy’s hands and legs were shackled to the anti-aircraft gun mounted on a pickup as Sudanese warplanes attacked. He saw another child chained to the steering wheel.

As their captors sought cover, the terrified children were ordered to stay and shoot down the jets over the capital, Khartoum. If they tried to flee, they’d be killed by their captors — if the planes didn’t get them first.

The boy, now 17, told The Associated Press that those who ordered him strapped to the gun were Colombian mercenaries providing military aid to Sudan’s Rapid Support Forces against the army in the war, now in its fourth year. Another child said he was forced to carry out artillery strikes and beaten for disobedience.

The rare, firsthand accounts show the perils faced by tens of thousands of children believed to have been conscripted into the war by all sides. Six former child soldiers who were abducted and forced to fight with the Rapid Support Forces, known as the RSF, spoke to the AP on condition of anonymity for fear of reprisal. Two said they were trained by Colombians.

Their accounts point to a wider deployment of Colombian mercenaries, who rights groups say were recruited by a state-linked firm in the United Arab Emirates to fight with the RSF. Human rights groups and Sudan’s military accuse the UAE of arming the RSF, and a UN panel said it had tracked weapons shipments to the RSF originating in the Gulf federation that includes Dubai.