Petraeus was preparing to testify to Congress on progress in the war-torn country as fighting between security forces and Shiite militiamen rocked Baghdad for a third straight day.

• 在安全力量和什叶派民兵之间震撼巴格达的冲突已经进入第三天的时候，彼得雷乌斯正准备就在这个饱受战火催残的国家的进展向国会作证。