The owner of a private security business on Park Avenue said he questions how a shooter got so far into a Midtown office building.

NEW YORK, NY - Multiple people have been killed, including one officer, after gunfire erupted in Midtown Manhattan on Monday afternoon, police sources told FOX 5 New York. Here's a live update on what's happening in New York. All time stamps are based on East Coast times. Four people were shot and killed in Midtown Manhattan on Monday.

Services begin with a viewing at a Bronx mosque for NYPD officer Didarul Islam followed by a procession. Officer Islam was off duty and working a security job when he was shot and killed by a gunman in a Midtown Manhattan office building.