Helicopters, SWAT teams and state troopers were searching Thursday for whoever shot and killed two Louisiana sheriff\'s deputies and wounded two others. A state police official described the attack on the officers as an ambush, CNN reported. The deputies from St. John the Baptist Parish were shot about 6 a.m. EDT while on traffic duty at the Bayou Steel Plant in LaPlace, said Louisiana State Police Sgt. Ann Dusang. A reason for the shooting is not yet known. It was not known how many assailants were involved in the shooting. The wounded deputies were hospitalized.