An active shooter incident occurred in Midtown Manhattan, New York, officials said. Here's what to know about 345 Park Ave.

An active shooter situation is unfolding at the Blackstone building, 345 Park Avenue near East 52nd Street in Midtown Manhattan. A suspect armed with an assault rifle has reportedly shot at least one person,

A shooting at a midtown Manhattan office building on Monday left multiple people dead, including an off-duty New York City police officer, officials said.