Boko Haram insurgents raided a Nigerian border town and attacked another in Nigeria’s Borno state, killing at least 12 people, military and vigilante sources said.

The town of Damasak, a few kilometers (miles) from the Niger border, had been recaptured from Boko Haram by Chadian and Nigerien troops in March but the insurgents have attacked it several times since.

Nigerien, Chadian and Nigerian security sources said that troops from the joint taskforce had recently withdrawn from Damasak. The insurgents attacked again before dawn on Tuesday, a military official and a vigilante leader in Maiduguri said.

“They burned houses and killed people but we don’t have figures. We withdrew from Damasak a few days ago because civilians came back but the Nigerian army never came to occupy the town. The Chadian troops are now in Diffa in Niger,” a Chadian security source said.

The Nigerian vigilante leader said few residents remained as they fled the moment the troops left, fearing an attack.

Boko Haram also attacked the hamlet of Warsala on Tuesday night, on the outskirts of Ngamdu, a town at the border of Yobe and Borno states.

At least 12 people were killed, according to a second military source and a bus driver from the village.

“Boko Haram also burnt down all the houses, cars and other vehicles including two trailers,” bus driver Bukar Aji said.