A gunman opened fire on workers at a utility office in the southern California city of Irwindale Friday afternoon before killing himself, NBCLA reported. There were conflicting reports about the number of victims. The Los Angeles County Fire Department said three people were killed and three others in critical condition. At least two other people were hurt in the attack, NBCLA reported. The shooting happened around 1:30 p.m. at a Southern California Edison office.