The shooting in Virginia came the same day that a worker opened fire at a UPS facility in San Francisco, killing three people before fatally shooting himself in the head with an assault pistol when the police arrived inside the facility. The gunman has been identified as 38-year-old Jimmy Lam. He was wearing a UPS uniform during the massacre and had worked as a driver for the company. ABC reports he had filed an internal grievance in March saying he was working excessive overtime. Two other people were also wounded in the shooting.