Iraqi officials say troops arrested a Sunni lawmaker sought on terrorism charges and killed his brother and three guards after they opened fire on the officers.

A police official says military and security forces arrived at dawn Saturday at the home of Ahmed al-Alwani, a prominent leader of Sunni protests against Iraq's Shiite-led government.

The official says al-Alwani's guards opened fire and the shootout in the western city of Ramadi lasted nearly an hour. Twelve guards and four soldiers were wounded.

Al-Alwani is also sought on terrorism charges for inciting violence against Shiites who came to power after the 2003 U.S.-led invasion that ended Saddam Hussein's Sunni-led regime.

A medical official confirmed the casualty figures. Both spoke on condition of anonymity as they were not authorized to talk to media.