Chris Brown is part of an assault investigation after an incident in Denver, Colorado.

It happened Monday night outside of the Platinum 84 Gentleman's Club, where Breezy was shooting a video with Fetty Wap and French Montana.

A woman, who wasn't involved in the video shoot, briefly boarded Brown's bus after it was done. According to her, she was roughed up and forcibly thrown off of the bus because she didn't abide by a no cell phone rule. She also said her phone was broken.

She has filed a police report for third degree assault and Brown and his entourage are "persons of interest" in the investigation.

TMZ has obtained surveillance footage from the strip club, which shows her being ejected from the bus. Since we can't see what happened inside of the vehicle, it's hard to judge if her claim is valid.