Sixteen soldiers in Western Australia's far north have been injured after their armoured personnel carrier rolled during a training exercise.

Among those hurt are seven members from the Tongan Defence Services, three from the Royal Fijian Military Service and six from the Australian Army.

The personnel carrier rolled near Fitzroy Crossing early this morning.

They were part of a community assistance program, helping to construct facilities for two remote Aboriginal communities near Fitzroy Crossing.

The injured soldiers have been airlifted by the Royal Flying Doctor Service to hospitals at Broome and Derby. The injuries range from head and spinal injuries to cuts and bruises. Twelve of the soldiers are still in the Derby and Broome hospitals receiving treatment.

An Army spokesman says the accident is being investigated by military police and the Western Australian police.

Police spokesman Senior Constable Kim McLeod says the stretch of road they were driving on is difficult.

"The driver may have just gone off to the incorrect side of the road and the vehicle has rolled from there."