Utah officials are investigating the role that so-called peacekeepers played in the killing of celebrated fashion designer Arthur Folasa Ah Loo on Saturday at the “No Kings” demonstration in Salt Lake City,

In a city notorious for unruly crowds at large sporting events, protesters were peaceful and law-abiding — as were the police.

The American Civil Liberties Union, one of the co-organizers of the protests, estimated that more than 5 million people participated in about 2,100 demonstrations across the U.S.