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.

People protest Trump administration policies in front of the Arizona Capitol during the "No Kings" rally, part of a nationwide series of demonstrations on June 14, 2025, in Phoenix.

Detectives don’t yet know why the alleged rifleman pulled out a weapon or ran from the peacekeepers, but they charged him with murder and accused him of creating the dangerous situation that led to A...