Thornton: Yeah, this 911?
Dispatcher: Yeah, can I help you?
Thornton: This is Omar Thornton, the, uh, the shooter over in Manchester.
Dispatcher: Yes, where are you, sir?
Thornton: I'm in the building. Uh, you probably want to know the reason why I shot this place up. This place here is a racist place.
Dispatcher: Yup, I understand that.
Thornton: They treat me bad over here, and they treat all the other black employees bad over here too, so I had to take it into my own hands and I handled the problem - I wish I could of got more of the people.
Police found 34-year-old Thornton in the warehouse, dead with a gunshot wound to his head.
Connecticut State Police released the audio of the four-minute 911 call on Thursday, the day company and union officials rebutted suggestions that Thornton had been a victim of racial harassment.
Thornton went on his rampage moments after he was forced to resign when confronted with video evidence that he had been stealing and reselling beer.
The 911 call confirmed suggestions from his relatives and girlfriend that he believed he was avenging racist treatment in the workplace.
The Associated Press contributed to this story.