The New York City office building that was the site of a mass shooting Monday had significant security measures in place.

After a gunman opened fire in a New York City office building and killed four people, experts share strategies for workplaces to implement to mitigate acts of violence.

Then officials say the suspect then got into the elevator and headed to the 33rd floor, the headquarters of Rudin Management.

NEW YORK -- A 27-year-old man wearing body armor and carrying an M4 assault rifle shot and killed four people, including ...

Five people—including the suspected perpetrator Devon Tamura and NYPD officer Didarul Islam—were left dead at an office ...

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

After Monday night’s shooting at 345 Park Ave., the Midtown corridor was seemingly back to business as usual Wednesday ...

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

A shooter killed four people at a Midtown Manhattan office building Monday before turning the gun on himself, police say.