Police in Colorado are reviewing officers reports and video of a 400-person riot that broke out after an Earth, Wind & Fire concert to determine if more arrests could be made.
The riot, which occurred early on Sunday morning local time in Fort Collins, 92km north of Denver, during the annual Bohemian Nights at NewWestFest festival left several people injured, a storefront damaged and a vendor tent destroyed by fire.
Six people were arrested on suspicion of interfering with police, obstruction, resisting arrest and disorderly conduct, Fort Collins police Officer Bob Younger said.
Thousands of people had travelled to Fort Collins on Saturday night to see 70s funk and disco band Earth, Wind & Fire perform at the arts and craft festival.
Reports suggest that two men got into a bar fight after the event. After they were ejected, a scuffle broke out, sparking a larger fracas.
Some threw beer bottles, patio furniture and other objects at police. They also damaged cars, stole thousands of dollars worth of items from festival vendor tents and set trash cans on fire.
“I think it was just a matter of a lot of intoxicated people being downtown at the same time,” a witness said. “I’m sure the tear gas didn’t help.”
Twelve people, who were thrown through windows during the riot, were treated at the Poudre Valley Hospital for cuts.
The Fort Collins Downtown Business Association called the incident "unfortunate and not a true representation of the safe and enjoyable environment that the community has come to know".
It is reportedly the worst riot of its kind in Fort Collins since 2004, when there was a similar disturbance near the Colorado State University campus after a series of off-campus parties of returning college students got out of control.