Black crime: Police are investigating a vicious beating at a McDonald's drive-thru in Denver

The attack happened in the middle of the busy lunch hour at the McDonald's on 3300 Colorado Boulevard near Martin Luther King Jr. Boulevard. Radio reference recorded dispatchers describing the attack, as multiple 911 calls came in. "Two black females are inside. They're fighting inside the car still in the drive-thru," one dispatcher can be heard saying. Shannon has been coming to the same drive-thru almost every day for five years without a problem... until this incident. "I witnessed this young lady throwing trash out of her car and all I said was that it wasn't cool," Shannon said. A few choice words later, Shannon thought the argument was over. "All of a sudden I was being attacked," Shannon said. Two women jumped out of the car in front of her. "She was right in my window just punching me in my face, pulling my hair," Shannon said. "She started biting on my hands so severely. I thought she was gonna bite 'em off, actually." Then a man jumped out of the car and threw a soda through her window. "He said, 'This is for you, you white b----. This is a grape soda.' And then they took off," Shannon said. The attack happened in plain view of a rooftop security camera, but Denver Police told Shannon that the actual beating wasn't caught on tape. Investigators won't release the security video, calling this an "open investigation." McDonald's management has no comment, but say it is cooperating with police. "If they can do that, they can snap and do something else. Something worse," Shannon said. Shannon hopes police find whoever beat her up before they do it again. "I don't want anybody else to get hurt like I got hurt," Shannon said. The description of the suspects - two black women and one black man - is vague. The best clue police have to go on right now is they were driving a light-blue Cadillac with temporary tags.