U.S. soldiers and Iraqi militants exchanged fire after a rocket attack from a Shi'ite Mehdi Army militia stronghold on a U.S. base southeast of Baghdad, Iraqi police said on Thursday, according to Reuters. An Iraqi police official said as many as 11 Katyusha rockets landed on the U.S. base near Kut, 170 km (105 miles) southeast of Baghdad, late on Wednesday. A U.S. military spokeswoman said the Americans responded after four rockets were fired at the base. She had no information about civilian casualties but said no U.S. soldiers were hurt in the exchange. Iraqi police said the rockets were fired from Kut's Shuhada district, one of four Mehdi Army strongholds raided by Iraqi police on Wednesday, a day after anti-U.S. cleric Moqtada al-Sadr's militia clashed with security forces.