Police have identified the man who they say entered a Midtown Manhattan office building wearing body armor and opened fire, killing four people with a high-powered rifle, as Shane Devon Tamura.

Photos released by the New York City Police Department show the assault-style rifle 27-year-old Shane Devon Tamura used to fatally shoot four people – including a police officer – and wound one before killing himself in Midtown Manhattan.

Officials said the gunman fatally shot himself after his attack, which set off a chaotic scene that rippled out into the heart of Manhattan during rush hour.