Footage obtained by human rights group Amnesty International and released on Tuesday appears to show Nigerian soldiers slitting the throats of Boko Haram suspects and dumping their bodies in a mass grave.
Nigeria's military is battling an increasingly vicious Islamist insurgency by Boko Haram, which wants to carve an Islamic state out of religiously mixed Nigeria. But its forces frequently come repeatedly under fire for human rights abuses, including torture and extrajudicial killings they usually deny.
It was not possible to independently verify the video, which also includes images of suspects being pulled off the back of trucks and beaten by soldiers and allied civilian militias.