An innocent bystander who was shot during a “No Kings” protest in Utah has died, police said Sunday. 

The victim, identified as Arthur Folasa Ah Loo, was shot during the Saturday protest, which attracted around 10,000 people, and died later that night, Salt Lake City Police Chief Brian Redd said.

“Our victim was not the intended target,” said Redd, who added that Ah Loo, 39, was just participating in the march. 

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Redd said Ah Loo was mistakenly shot by one of two event peacekeepers in neon vests who opened fire after a suspect, identified as Arturo Gamboa, 24, ran toward the crowd with a rifle. 

They saw Gamboa pull out a rifle before raising it in a firing position before moving toward a crowd of protesters, Redd said. One of the men in the vests fired three times, striking Gamboa and the victim, who later died. 

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Gamboa was wounded and was allegedly found with a rifle and a gas mask in his backpack. Paramedics took Gamboa to the hospital. Detectives later booked Gamboa into the Salt Lake County Metro Jail on a charge of murder.

Two SWAT medics performed life-saving care on the victim before he was taken to a hospital, where he later died, police said. 

The shooter was cooperating with investigators, police said. 

Gamboa, who did not fire a shot, doesn’t have any criminal history, the chief said.