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.

An estimated 5 million people participated in the nationwide 'No Kings' protests. The organizers have another national day of action planned for July.

A 39-year-old man died Saturday after being shot during a large “No Kings” protest in downtown Salt Lake City, Salt Lake City Police Chief Brian Redd said Sunday.

Arthur Folasa, who gained fame as "Afa" Ah Loo during season 17 of Project Runway, has been identified as the victim who was fatally shot over the weekend during a "No Kings Protest" in Salt Lake City,

Officials have expressed caution around the nationwide “No Kings” protests after two Minnesota state lawmakers and their spouses were shot early Saturday. One lawmaker and her husband died while the other two survived with severe injuries.

Organizers of last weekend's "No Kings" protests are celebrating the event as the one of the largest mass demonstrations in U.S. history, and already have another rally on the books. Why it matters: Building off the success of Saturday's rallies,