A private security guard for a TV station was in custody as authorities on Sunday probed a fatal shooting after an altercation erupted during opposing rallies in downtown Denver.

The violence flared Saturday afternoon in Civic Center Park after a man participating in what was called a “Patriot Rally” sprayed mace at another man, according to the Denver Post.

The man who was shot near the Denver Art Museum was taken to a nearby hospital, where he died an hour later,  KUSA TV station said. The station said on its website that it had contracted the private security guard who was arrested in connection with the shooting.

“It has been the practice of 9NEWS for a number of months to hire private security to accompany staff at protests,” the station said.

Denver police on Sunday identified the security guard as Matthew Dolloff, 30, and said he was being held held for Investigation of first-degree murder in connection with Saturday’s incident.

A verbal altercation ensued before the shooting, said Joe Montoya, division chief of investigations for the Denver Police Department.

A “private security guard with no affiliation with Antifa” is a suspect in the incident, Denver police tweeted earlier Saturday.

There was a heavy police presence downtown Saturday afternoon, and officers attempted to keep “two groups with opposing views” apart, Montoya said. Two guns and a can of mace were found at the scene, he said.

 A counterprotest called “BLM-Antifa Soup Drive” took place in the park about the same time as the Patriot Rally.

The right-wing Patriot Rally protesters gathered in the park’s amphitheater and occasionally chanted patriotic songs and hoisted banners, the Post reported.

Participants in the left-wing rally held up flags and signs deriding Nazis and white supremacists as they gathered in the middle of the park, several hundred feet from the barricaded amphitheater, the Post said.

Denver Mayor Michael Hancock said violence was not acceptable.

“While we encourage peaceful protest, we will never tolerate demonstrations escalating to clashes and violence. Political differences should be resolved at the ballot box and not in the streets, and we will keep it that way through this election season and beyond,” he tweeted.

Clashes between protesters have escalated in recent months in some cities.

Kyle Rittenhouse, 17, has been charged with fatally shooting two people days after Jacob Blake, a Black man, was shot by police in Kenosha, Wisconsin.

Rittenhouse’s arrest has become a rallying point for some on the right. A legal defense fund has attracted millions in donations, and President Donald Trump has even defended the teen.  

Others see Rittenhouse as a domestic terrorist whose presence with a rifle incited the protesters.

In Portland, Aaron “Jay” Danielson, 39, a supporter of Trump and the far-right Patriot Prayer group, was shot and killed Aug. 29 after dueling protests in Portland.

Contributing: The Associated Press

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