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,

Salt Lake City police are investigating the roles of two self-described "peacekeepers" following a fatal shooting at Saturday's protest that left one person dead and another injured, raising questions about unauthorized security at public demonstrations.

A 39-year-old man died Saturday night after being shot during Salt Lake City’s “No Kings” protest while a crowd of about 10,000 people marched.