The Norco shootout was an armed confrontation between five heavily armed bank robbers and deputies of the Riverside County and San Bernardino County sheriffs' departments in Norco, California, on May 9, 1980. Two of the five perpetrators and one sheriff's deputy were killed, at least ten other law enforcement officers, one citizen and three other perpetrators were wounded, and massive amounts of gunfire damaged at least 33 police cars, a police helicopter, and numerous nearby homes and businesses. The Norco Shootout remains the most violent bank robbery in American history to this day.