Washington, July 29 -- At least four people, including a New York Police Department officer, were killed in a shooting incident in Manhattan on Monday evening. The gunman, identified as 27-year-old Shane Tamura from Las Vegas, also died from a self-inflicted wound, NYPD confirmed.

Investigators said Tamura had a concealed carry permit and an expired private investigator license, according to a CNN report.

The New York Post reported the shooter wore a bulletproof vest and was armed with an AR-style rifle when he opened fire inside the Park Avenue skyscraper-just blocks away from major landmarks like Grand Central Station and the Museum of Modern Art.

The first exchange of gunfire occurred in the lobby of 345 Park Avenue around 6:40 pm. ...