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.

The “No Kings” protest in Salt Lake City was struck by violence when a man allegedly brandished a rifle near the crowd.

At 7:56 p.m., Redd said a police officer heard shots near 151 S. State St. First responders soon found Ah Loo injured on the ground. Medics quickly surrounded him, offering aid, but he died later at a local hospital.

As 40 people sheltered in a covered space in downtown Salt Lake City after the No Kings shooting, somebody saw a man with a gun.

A 16-year-old boy shot five people in a confrontation between two groups at a carnival in a Salt Lake City suburb Sunday, killing three of them including an 8-month-old infant. Police say the

Arthur Folasa Ah Loo, 39, has died as the result of a gunshot wound he sustained Saturday in a shooting during a protest against President Donald Trump in Salt Lake City.

Utah resident Arthur Folasa Ah Loo, 39, was shot and critically wounded during the protest in Salt Lake City on Saturday, June 14. He later died in the hospital from his injuries, the Salt Lake City Police Department confirmed in a news release.

Thousands gathered at Salt Lake City’s Pioneer Park Saturday evening for another “No Kings” protest, following the earlier demonstration at the University of Utah.