The Associated Press

OLYMPIA — Police in Olympia arrested one person Saturday afternoon following a shooting at a violent protest between two heavily armed groups near the Capital building.

The Thurston County sheriff’s office confirmed the arrest but didn’t immediately release details.

The Olympia Police Department said the person who was shot was taken to a hospital by other civilians. That person’s injuries are unknown.

Police said they are aware of several videos involving the shooting.

The two groups had opposing political views, and each side was heavily armed with rifles, handguns and clubs, and engaged in violent clashes, police said. Police arrested a person earlier in the day for a firearms violation.

“We’ve had sporadic confrontations between groups throughout the day,” said Sgt. Darren Wright of the State Patrol.

About 100 law enforcement officials with Olympia Police Department, Thurston County Sheriff’s Office and Washington State Patrol tried to keep the protest orderly. Police declared a riot early in the afternoon and told the crowds to disperse.

Officials described a chaotic, fluid situation where the two groups clashed on the streets in Olympia before moving onto the grounds of the Capital building, where they continued engaging in violence against each other. Many of the protesters wore helmets and carried shields and clubs.

“Both groups were heavily armed, including firearms,” said Lt. Paul Lower of the Olympia Police Department. “They were fighting amongst themselves, two factions with opposing political beliefs.”

Groups planning demonstrations in the city included a group that wanted COVID-19 restrictions lifted, another protesting President Donald Trump’s loss in the presidential election last month, and a Black Lives Matter counter-protest.

Police said the groups were dispersing away from the Capital and back onto city streets when the shooting occurred. Video in the aftermath of the shooting shows a person on the ground, and another with a handgun walking across a parking lot.

Black-clad protesters get as far as Union and Capitol before flash bangs push them back to 11th and Capitol. pic.twitter.com/zWDb1Tja7W

— Rolf Boone (@rolf_boone) December 12, 2020

Flash bangs used to push back Antifa-style protesters again. pic.twitter.com/eJUAZItCcd

— Rolf Boone (@rolf_boone) December 12, 2020

Law enforcement redirects protesters again on Capitol Way. pic.twitter.com/7CeShQ25qa

— Rolf Boone (@rolf_boone) December 12, 2020

Much heavier law enforcement presence today. pic.twitter.com/Qk5ajfB3BN

— Rolf Boone (@rolf_boone) December 12, 2020