The 27-year-old Nevada man left a note at the scene voicing anger that his mental illness may be linked to his having played ...

Four people died after a gunman opened fire in a Manhattan office building, and security footage showed the shooter calmly ...

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

The gunman in the deadly shooting at a New York City office tower had a background in casino surveillance and once held a ...

A man carrying a rifle killed four people at a New York City office tower Monday, including an off-duty New York City police ...

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

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, including an NYPD officer, inside a Manhattan office building Monday evening left a note ...

The suspect in the shooting that took place in New York City today had driven from Las Vegas to New York and was known to ...

Authorities confiscated several items from a Las Vegas apartment tied to a gunman who used an AR-15-style rifle to kill four ...

As investigators work to uncover a motive, questions are being raised about how a man with a documented history of mental ...