Boko Haram terrorists ambushed a military convoy in northeastern Nigeria, killing 13 soldiers and a policeman, the army said Wednesday, while an officer put the death toll at 18.

The convoy “fought through an ambush staged by Boko Haram terrorists” late Monday on a highway linking Borno state capital Maiduguri with Damaturu in neighboring Yobe state, an army statement said. However, an officer, speaking on condition of anonymity, said 17 soldiers plus one policeman had died.