The Palmetto State Armory M4 assault rifle used in the shooting that killed an NYPD cop and three civilians is .223-caliber ...

The New York City Medical Examiner determined a cause and manner of death for the gunman who killed four people inside a ...

Wearing body armor and wielding an assault-style rifle, the alleged gunman burst into a Midtown Manhattan office building ...

Authorities also found a vehicle with Nevada plates registered to Tamura at the scene, with a rifle case inside, sources said.

Once a promising athlete, the 27-year-old faded from public view—until he showed up at 345 Park Avenue, gun in hand.

One theory is that Tamura went dark on social media or cut ties with certain people. His behavior back then may have been a sign of the decline in mental health that culminated in Monday’s shooting, ...

Tisch said Tamura had a Nevada gun license and used an AR-15 style assault rifle. Tamura legally purchased a revolver in June using his concealed carry permit, Tisch said. CBS and CNN published a ...

NYPD said the gunman purchased the fully-assembled AR 15-style rifle used in the shooting from his supervisor.