Nigerian villagers claim Cameroonian troops in cross-border pursuit of Boko Haram Islamic extremists have shot and killed at least 40 civilians — the third such accusation of reckless killings by the Cameroonians in recent weeks.

Muhammad Abba, deputy commander of a civilian self-defense group, said trapped relatives called him to say they counted at least 40 corpses scattered around the Gwadale border community in northeast Nigeria on Tuesday.

The first such story came from refugees who said Cameroonian soldiers killed about 150 people along a 150-kilometer (95-mile) stretch of the border on Nov. 30. It came days after Nigerian officials refused requests from neighboring states to create a no-go zone along the border.

Cameroon has said its troops follow strict humanitarian rules of war. Nigerian government officials have not commented.