Four people were killed, including an off-duty New York City police officer, when a gunman opened fire in an office tower before fatally shooting himself, officials said.

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

Police are investigating a reported active shooter at a Midtown Manhattan high-rise. Here’s what we know about the suspect involved in the incident near Park Avenue.