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

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

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

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 who opened fire at a Manhattan office building Monday, killing four people before taking his own life, legally ...

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

The man who stormed a Manhattan office tower with a gun, killing four people before killing himself, worked in the ...

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 ...

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

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