Two female suicide bombers killed at least 11 people in northeast Nigeria after hiding among residents fleeing a suspected Boko Haram attack on a remote village

Two female suicide bombers killed at least 11 people in northeast Nigeria after hiding among residents fleeing a suspected Boko Haram attack on a remote village, police and a local official said on Sunday.

The attack happened in Dar village, in the north of Adamawa state, on Saturday evening, the former head of the Madagali local government council, Maina Ularamu, said.

Boko Haram has repeatedly attacked the area, which is near the border with Borno state to the north and the Islamists' Sambisa Forest stronghold, prompting calls for better security.

"Residents fled to the bush. After a while, two women who disguised as fleeing locals blew themselves up... while the gunmen shot at survivors," he told reporters.

Ularamu said "so far 12 corpses have been found" but the Adamawa state police spokesman, Othman Abubakar, confirmed 11 dead.

On October 1, seven people were killed in the village of Kirchinga, near Madagali, while four people were killed on September 30 in two other villages close by, both in similar raids.

On September 11, seven people were killed when a bomb went off at a camp for people displaced by the conflict outside the state capital, Yola -- the first time Boko Haram has attacked refugees.

Thirty-one people were killed when two male suicide bombers detonated their explosives at a market in Yola on June 4.

Suicide bombings are fast becoming Boko Haram's preferred method of inflicting mass civilian casualties, accounting for seven of the eight recorded Boko Haram attacks this month in Nigeria.