Police in Portland, Ore. say they made no arrests after a violent clash between rivaling protest factions in the city’s downtown area.

The Saturday night incident is the latest brawl in an ongoing feud between the right-wing group Patriot Prayer and the left-wing Antifa group.

The Oregonian reported that protesters used “bear spray, bare fists and batons” to attack each other outside a bar for more than a minute before riot police showed up.

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Police also said they observed firearms and knives in the chaos, and are continuing to investigate.

Social media video and images show bloodied participants and a crowd reacting to pepper spray, allegedly sprayed by Antifa members.

Team Patriot Prayer licking wounds post rumble with antifa / antifascist activists, who unleashed pepper spray into the confrontation. pic.twitter.com/kwemkZkSsl — Shane D. Kavanaugh (@shanedkavanaugh) October 14, 2018

Huge brawl just happened and police came in to firenless lethal rounds on people. Right-wingers were clubbing people w clubs outside of Kelly’s Olympian, way worse than NYC last night. proud Boys and Patriot prayer and Antifa just had a huge wild fight pic.twitter.com/a750y2ai7J — Mike “Vampire Hunter B” Bivins (@itsmikebivins) October 14, 2018

The fight appears to be tied to local tensions over law enforcement and race relations in the city. The violence erupted around a memorial for a 27-year-old black man who was killed in a police-involved shooting, according to The Oregonian.

Police put a stop to the fight by firing pepper balls at the battling protesters.