The gunman who killed four people, including an NYPD officer, inside a Manhattan office building Monday evening left a note ...

The life of Aland Etienne, the security guard who was killed last month at a Manhattan office tower, is being remembered.

During evening rush hour in New York City on Monday, a man calmly walked into a Park Avenue office building lobby and killed ...

Investigators are examining why the gunman who killed four people before taking his own life at a New York City office tower ...

The 27-year-old man who shot and killed four people at a Midtown office building on Monday carried a note in his pocket, ...

The Manhattan office building shooting victims include NYPD Officer Didarul Islam, Blackstone executive Wesley LePatner and ...

Workers returned to 345 Park Ave., on Monday​ under the watchful eyes of NYPD officers and a surplus of security after the ...

The pair of illegal immigrants arrested in the shooting of an off-duty Customs and Border Protection officer allegedly ...

The funeral will be held Thursday for the police officer who was one of four people killed in Monday's mass shooting at a ...

The New York police officer killed in a mass shooting in a Manhattan skyscraper on Monday was an immigrant who left behind a ...

Graham Gano stayed late at the New York Giants' practice facility Monday watching news coverage of a gunman killing four people at a Manhattan office building that includes the NFL headquarters ...

Here's how NFL players, coaches and executives reacted to a mass shooting at the league's office building in Manhattan: ...