A person shot and killed an innocent bystander during a “No Kings” protest in Salt Lake City, Utah, on Saturday.

The person suspected of being a protest “peacekeeper” fired his weapon three times after Arturo Gamboa, 24, pulled out a rifle from his backpack. The incident occurred around 8 p.m. on Saturday when Gamboa, who was marching in the protest, stepped off to the side near a wall and pulled out a rifle. Two supposed peacekeepers in vests confronted Gamboa before shooting at him, inflicting a minor injury on Gamboa and also fatally striking Arthur Folasa Ah Loo, 39, a fashion designer from Samoa. Ah Loo later died at the hospital.