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

Officer Didarul Islam, 36, who was guarding the building on a paid security job when he was killed, had served as a police ...

The gunman who killed four people in a New York City shooting Monday was the son of a former Los Angeles Police Department ...

The NYPD continues to work with investigators across the country to learn more about the gunman in Monday's deadly Midtown ...

Follow along for live updates on the New York City shooting, where police investigate motive after five people, including the ...

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

LAS VEGAS -- The gunman who killed four people before taking his own life in a midtown Manhattan office building that houses ...

A lone gunman walked into a midtown Manhattan office building Monday and opened fire, killing four people, including an NYPD ...

The Las Vegas casino security supervisor who sold the assault-style rifle used in Monday's mass shooting in a Park Avenue office building complied with the law, his attorney said.

Officials say a man carrying a rifle killed four people at a New York City office tower. The shooting took place Monday ...

Live updates and developments about a shooting in New York City's Midtown. Five people, including the gunman and a police ...

Officials said July 29 they believe the suspected gunman in the deadly Manhattan shooting may have been targeting the NFL.