Gunmen wearing military uniforms and suicide bomb belts stormed a local government headquarters in northern Iraq on Tuesday in an attempt to take hostages that killed at least 10 people, officials said. Three lawmakers who were inside the Salahuddin provincial council building in Tikrit when the gunmen overran the compound are missing, said provincial governor Ahmed Abdullah. He said the lawmakers were not answering their mobile phones and could not immediately be located - indicating they may be held hostage. "We've lost contact with three provincial council members who were inside the building when the attack took place," Abdullah said in a telephone interview from Amman, Jordan, where he was receiving updates on the assault via mobile phone. He described a fierce shootout between at least eight gunmen, who have overtaken the council headquarters' second floor, and Iraqi security forces who surrounded the building. He said the attackers were hurling grenades at Iraqi forces. The governor said 10 people were killed in the siege. A senior intelligence official in Baghdad gave a higher toll of 12 dead and said as many as 60 were wounded. Conflicting casualty accounts are common in the confusion that immediately follows such attacks. The official spoke on condition of anonymity because he was not authorized to release the information.