A gunfight erupted Saturday in central Baghdad after the local leader of a Sunni group that broke with al-Qaida was arrested for his alleged role in terrorist acts, Iraqi officials said. Adil al-Mashhadani, the head of an Awakening Council group, was detained Saturday along with an aide after a warrant was issued for his arrest, Iraqi military spokesman Maj. Gen. Qassim al-Moussawi said. The shootout broke out after Iraqi army and police units served the warrant in Fadhil, a Sunni enclave on the east bank of the Tigris River that was run by al-Qaida until US and Iraqi soldiers regained control in 2007. Four people - three civilians and a policeman were killed - and 10 people were wounded in the shooting, according to police and hospital officials. They spoke on condition of anonymity because they were not supposed to release information to media.