A New York City police officer and three other people were shot and killed inside a Midtown Manhattan office building on Monday evening by a gunman armed with a high-powered rifle, police confirmed.The suspect,

New York City law enforcement officials were working to unravel what took place and why this location in Manhattan may have been targeted.

NEW YORK (AP) — A shooting at a midtown Manhattan office building on Monday left at least five people dead, including an off-duty New York City police officer, sources told the The Associated Press. The suspect was identified as Shane Tamura, of Nevada, two people briefed on the investigation told the AP. Sources said he fatally shot himself.