Insurgents of Boko Haram terrorist group attacked the Nigerian border town of Gambaru Wednesday afternoon, killing at least 10 people, two security sources told Reuters on Thursday. The town located on the Nigerian-Cameroonian border near Lake Chad, had been liberated from militant control by Chadian troops last month. The foreign soldiers, which entered as far as Dikwa in Nigeria's northeast Borno state, pulled back last week into Cameroon.