Six officers and seven imprisoned insurgents were killed Friday morning in a riot and jailbreak in the city of Ramadi, Iraqi police said. Maj. Gen. Tariq Yousif, the police chief of Anbar province, said four prisoners escaped in the bloody chaos that broke out. According to Yousif, a prisoner held in a cell with 11 others asked a guard to allow him to go to the bathroom. When the guard opened the cell door, the prisoners pulled him in, grabbed his assault rifle and killed him, then attacked other police. The police chief said the prisoners involved were all suspected insurgents of al-Qaida in Iraq.