The gunshots caused hundreds of people to flee for safety, with some hiding behind barriers and running into nearby parking garages and businesses, according to police.

The shooter and another person in a neon vest allegedly saw Gamboa separate from the crowd of marchers in downtown Salt Lake City, move behind a wall and withdraw a rifle around 8 p.m., Redd said.

The shooter and another person in a neon vest allegedly saw Gamboa separate from the crowd of marchers in downtown Salt Lake City, move behind a wall and withdraw a rifle around 8 p.m., Redd said.