A U.S. official says four Marines are dead after a shooting attack at two military facilities today in Chattanooga, Tennessee. The official says the lone gunman involved in the attack was also killed. According to the official, two others, a soldier and a police officer, were wounded. The shootings happened at two military recruiting offices in Chattanooga, sending troops scrambling for safety. A woman who says she witnessed the shooting in Chattanooga says she heard a barrage of gunfire near one of the shooting sites. She says she ran inside, where she remained with other employees and a customer. The gunfire continued with occasional bursts she estimated for 20 minutes.