Five Indonesian police officers and a prisoner were killed in clashes at a high security jail that saw Islamist inmates take an officer hostage, authorities said Wednesday, with negotiations underway to secure his release. The deadly riot broke out late Tuesday at the facility inside the Mobile Police Brigade headquarters in Depok on the outskirts of Jakarta. It comes several days after the arrest of three terror suspects accused of plotting to attack the police headquarters and other facilities in the same area. Former Jakarta governor Basuki Tjahaja Purnama, who was sentenced two years in prison for blasphemy after losing a re-election bid, is also held in the jail. Purnama, better known as Ahok, are not housed in the part of the prison where the riot broke out.