SEE IT: Black Lives Matter protesters beaten at pro-police rally in Colorado

A group of Black Lives Matter demonstrators were beaten up during a pro-police Back the Blue rally in Colorado on Saturday.

The rally was held in front of the Fort Collins Police Services building where people waved “thin blue line” flags and carried signs with slogans like “defend the police.” At one point, at least two counter-protester groups, including a Black Lives Matter group that had held its own rally earlier in the day, arrived across the street from the pro-police group.

According to witnesses, the violence didn’t start until members of the Black Lives Matter group crossed the street to speak with the pro-police group.

In video of the incident, recorded on Saturday in Fort Collins, the protesters, who were vastly outnumbered by the pro-police group, are quickly surrounded and pushed toward an open, grassy area before they are attacked with punches and hit with various objects as the groups fall over each other on a ditch. At one point a man stabs at a man in all black with an American flag on a pole and another man strikes a man who is on the ground with what looks like a baton.

Several other videos show the fighting and aftermath.

“I was at the Pro Police FCPD rally today,” Ciara Wilson wrote on Instagram along with video of the violence. “Counter protestors were violently beaten and had no signs of aggression or hostility. Pro Police protestors forced them to the end of the block and then savagely assaulted them. Afterwards the COUNTER PROTESTORS WERE DETAINED. The officers did not tell them why they were being detained. The pro police protestors who literally assaulted these people for no fucking reason other than being PSYCHOPATHS got away with it. I am so sick and tired of this.”

Witnesses said that the fighting continued for about five minutes before the police arrived.

A group of Black Lives Matter demonstrators were beaten up during a pro-police Back the Blue rally in Colorado on Saturday. The rally was held in front of the Fort Collins Police Services building where people waved “thin blue line” and carried signs with slogans like “defend the police.” At one point, at least two counter-protester groups, including a Black Lives Matter group that had held its own rally earlier in the day, arrived across the street from the pro-police group.

According to Fort Collins police, at least three arrests were made as part of the “physical disturbances.” Another person received a citation.

A Fort Collins detective told the Denver Post that those arrested and cited were among both the pro-police and Black Lives Matter groups.

Fort Collins police said an investigation was ongoing and anyone with videos or information should contact the police.