U.S. soldiers said they missed catching Saddam Hussein's security chief - and possibly the former Iraqi president himself - by a mere 24 hours early Sunday, while a U.S. Marine was killed in a grenade attack south of Baghdad. Troops stormed three farms in Tikrit, Saddam's hometown, in simultaneous pre-dawn raids after receiving a tip that Saddam's new security chief was staying at one of the farm houses, said Lt. Col. Steve Russell, who led the operation by the of the 4th Infantry. "We missed him by 24 hours," Russell said, adding that residents told soldiers that the man they sought had been at one of the farm houses. The military said one U.S. soldier attached to the Marines was killed and one was wounded in the grenade attack just south of Baghdad. The death was the first of the week after one of the bloodiest seven-day periods in the guerrilla war against American forces since President Bush declared major combat in Iraq was over on May 1