The gunman who killed four people at an office building in New York City on Monday evening left his home in Las Vegas, Nevada late last week.

Multiple casualties as gunman opened fire in the lobby of the midtown Manhattan building on Park Avenue that is home to the Blackstone investment firm and other corporations before moving to other floors.

Five people were shot by a gunman wielding a high-power M4 rifle in a Midtown Manhattan building, with four victims succumbing to their injuries. One of the four victims was an off-duty New York Police officer assigned to a Bronx precinct, NYC Mayor Eric Adams said Monday evening.