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.

A lone gunman walked into a midtown Manhattan office building Monday and opened fire, killing four people, including an NYPD officer, before turning the gun on himself.

Police are investigating a reported active shooter at a Midtown Manhattan high-rise. Here’s what we know about the suspect involved in the incident near Park Avenue.