Iraqi troops raided a Muqtada al-Sadr stronghold Friday, killing one of the Shi'ite leader's guards and arresting another, his supporters said. Spokesman for al-Sadr's office, Ali al-Moussawi, said troops entered Baghdad's Sadr City as worshippers headed to dawn prayers at a mosque. The soldiers opened fire on a guard and one of al-Sadr's offices when he tried to escape arrest. Al-Moussawi said the guard was wounded and died near his home. Another guard was arrested.