A gunman opened fire Monday outside a midtown Manhattan building that houses the National Football League offices and some of the country's top financial firms, killing an off-duty New York City police officer working security in the building and four others, sources told The Associated Press.
The suspect was identified as Shane Tamura, of Nevada, two people briefed on the investigation told the AP. Law enforcement officials found identification on Tamura's body, including a concealed carry permit from Las Vegas, the people said.
Police sources told ABC News they believe the suspect later died from a self-inflicted gunshot wound after fleeing into the 44-story building at 345 Park Avenue.