Forced out of Brazzaville, Cocoye and Ninja fighters regrouped, initiating clashes in the northern cities of Impfondo, Ouesso and Owando as well as Pointe-Noire. In April 1998 Cocoye insurgents captured the Moukoukoulou Hydroelectric Dam located in the Bouenza department, killing several employees and cutting off the electric supply to Point-Noire for several weeks. On 29 August 1998 Ninja guerrillas killed the police commissioner of Mindouli. On 26 September 1998 Ninja rebels assassinated the deputy prefect of Goma Tse Tse. On 9 October 1998 Ninja rebels set fire to the police station and prefecture offices of Kinkala.