A man who was believed to be part of a peacekeeping team for the “No Kings” protest in Salt Lake City shot at a person who was brandishing a rifle at demonstrators, striking both the rifleman and a bystander who later died at the hospital, authorities said Sunday.

Arthur Folasa Ah Loo, 39, was struck at an anti-Trump rally in Utah after peacekeepers opened fire on another man who had pulled out an AR-15 style rifle.

Police say Ah Loo was an innocent bystander caught in the line of fire between peacekeepers and a man with an AR-15-style rifle.