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.

Five people were shot, three fatally, at the festival in Utah's West Valley City after an altercation broke out between two groups of people.

A crazed gunman was taken into custody Saturday night after allegedly opening fire on thousands of protesters during a “No Kings” march, which left one person critically injured, Utah