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

A Nevada man who recently drove across the country to New York and has a mental health history is accused of walking into a Manhattan building with a rifle and opening fire Monday evening, killing four people,

NYPD Chief John Chell describes Midtown Manhattan office shooting as mayhem after gunman Shane Tamura killed four people, including Officer Didarul Islam.