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

Police searched Shane Tamura’s employee locker at a Las Vegas Strip casino in their attempts to piece together why he killed ...

The New York City Police Department sent detectives to Las Vegas to work with the Bureau of Alcohol, Tobacco and Firearms to ...

LAS VEGAS -- The gunman who killed four people before taking his own life in a midtown Manhattan office building that houses the NFL's headquarters had for years sought medical help for frequent, ...

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 attorney for the man who sold what would become the deadly weapon in a mass shooting in New York City earlier this week ...

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

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

New York City police detectives searched a studio apartment in Las Vegas that belonged to the suspected gunman in Monday's ...

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 ...

Four people, including an off-duty New York City police officer, were killed Monday when a gunman carrying a rifle opened ...