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, identified as Shane D. Tamura, 27, of Las Vegas, died of a self-inflicted gunshot wound, police said.

NYPD Commissioner Jessica Tisch said surveillance video shows the suspect exiting a double-parked black BMW alone on Park Avenue between 51st and 52nd streets just before 6:30 p.m., carrying an M4 rifle in his right hand. He then entered the 44-story building at 345 Park Ave., turned right and immediately began opening fire on an NYPD officer.

Not long after, multiple 911 calls were received about an active shooter inside the building , Tisch said. The building contains

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