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

Some 10,000 people gathered in Salt Lake City for a "No Kings" rally and march as President Donald Trump was overseeing a military parade in Washington, D.C. About an hour into the march, shots were fired.

Saturday marks the first full day of Marines on duty in Los Angeles, one week after protests against Immigration and Customs Enforcement raids ignited in LA.

Arthur Folasa Ah Loo, 39, a Samoan-born fashion designer, was participating in an anti-Trump protest in Salt Lake City on Saturday when he was shot by a man working security, the police said.

As prosecutors consider potential criminal charges against the man whose alleged actions caused the shooting death of another man during Saturday's "No Kings" protest, the investigation into the so-called "peacekeeper" who actually fired the fatal shot also continues.

I am so deeply saddened by the loss of life, especially that of an innocent bystander and an infant," Salt Lake County Mayor Jenny Wilson said in a statement.

A Utah fashion designer, father, and community leader is being remembered after his life was cut short at the "No Kings" protest in Salt Lake.To his community,