The gunman who killed four people, including a New York City police officer, during a shooting Monday inside a Manhattan ...

His AR-15 assault rifle, which he bought from a co-worker for $1,400, had a full clip of 15 bullets, police said.

On Monday night, police said he entered the skyscraper at 345 Park Avenue in Midtown Manhattan and immediately opened fire in ...

The man who killed four people at a Manhattan office building bought his AR-15-style rifle and getaway car from his Las Vegas ...

Shane Tamura, a 27-year-old former high school athlete, has become the subject of a national homicide investigation following ...

NYPD detectives, collaborating with Nevada authorities, are investigating the Park Avenue shooting carried out by Shane ...

Exclusive video shows SWAT teams executing a search warrant at the Las Vegas apartment of Shane Tamura, the man behind Monday ...

There were 23 shell casings and 13 bullet fragments recovered from the lobby of 345 Park Avenue and 24 spent shell casings on ...

Authorities say the man who killed four people at a Manhattan office building bought the rifle he used in the attack and the ...

Investigators found also found 800 rounds and a 357-caliber handgun in a BMW the shooter drove to the scene, the NYPD said.

A Las Vegas man, Shane Tamura, opened fire in a Midtown Manhattan office tower, killing four people before ending his own ...

Investigators found a note left by Midtown mass shooter Shane Tamura at his Nevada apartment saying he felt like a ...