As previously described, the FNL briefly resumed open hostilities in April 2008, attacking military posts around Bujumbura with guns, grenades, and mortars. They also launched mortars and rockets at Bujumbura, striking two homes and a university campus.[68] FNL combatants who were concentrated in civilian areas, mostly in Bujumbura Rurale province, also carried out massive looting in the course of hostilities. In at least one case, they were alleged to have burned down houses as they retreated. Local officials and humanitarian aid organizations estimated that over 20,000 civilians were temporarily displaced as a result of combat.[69]