Sources tell CBS New York that a shooting at the Empire State building Friday morning that left as many as ten injured and two dead, was committed by a disgruntled worker who fired at former co-workers.

PICTURES: Shooting at Empire State Building

According to the station, sources say the gunman - who was shot and killed by police - had been fired from Shanghai Henson Import and Export Co., Ltd the day before the shooting. The second person killed in the shooting was reportedly the gunman's manager.

"What we're told is this involves co-workers and a disgruntled employee who showed up at the work place at the Empire State Building today, opened fire on a number of co-workers," CBS News Senior Correspondent John Miller reported told WCBS 880.