UPDATE: A Denver police spokesman initially said on Sunday that 17 people were arrested but then revised that number later in the day to 36.

Thirty-six people were arrested Saturday from what police said was a separate group of protesters over two hours after the "No Kings" protest in Denver.

Almost every person arrested was charged with failure to obey a lawful order, Denver police said, but some were also charged with interference with police authority, unlawful throwing of projectiles, and obstruction of streets. One person had a warrant out of Delta County and another person was charged with possession of a controlled substance.

The ages of those arrested mostly ranged from 18 to 51, with the majority of those arrested in their 20s, although one minor was cited and released, and Denver police said it had not yet verified the identity of six of the people who were arrested.

One group of protesters clashed with police near West Colfax Avenue and Speer Boulevard near the entrance to Interstate 25, police said, and another group allegedly attempted to enter I-25 closer to 20th and Blake Streets.

Around 9:20 p.m., Denver police say some protesters threw rocks and other objects there and near West Colfax Avenue and North Osage Street, and officers in the area declared an unlawful assembly.

Protesters in those areas remained in the area, with some starting to throw objects at officers, police said, and officers at the scene shot pepper balls and launched smoke, and the crowd left. A department spokesman said tear gas wasn't used.

Then, around 10 p.m., one protester allegedly started a small fire in the street near West 14th Avenue and Lincoln Street near the State Capitol. The fire burned out on its own, and the roadway was already closed to traffic due to the protest. Police didn't say if the person accused of starting that fire was among those arrested.

Several thousand people attended the "No Kings" protest in Denver earlier that day, and both Denver police and national organizers of the "No Kings" protests celebrated the rallies as overall peaceful.

"Since approximately noon today, DPD has managed five demonstrator marches near the State Capitol Building and in the downtown area. Those marches were peaceful," Denver police said Saturday night.

"So long as people's rights are under attack, people are going to come out and demonstrate. People are going to come and fight for ensuring that our rights are secured and fight for each other," Alfonso Espino, an organizer with the Denver chapter of the Party for Socialism and Liberation, said. "For all of that rhetoric, the initiators of violence has always been this government."

Jack Hoffman, one protester, said he saw at least one person burning an American flag and said "there's a lot of emotion going around. You can tell everyone's angered with the actions that's been taking place in the United States recently." He went on to say that some of the protesters "had close connections with what's happened and are being affected."

Several protesters, who asked not to be identified, told CBS News Colorado that the protest was overwhelmingly peaceful, but that those who did clash with police don't represent the entirety of the movement.

One said that among those arrested, however, were peaceful protesters who were swept up by police.

"This was a peaceful protest and unfortunately, like always, they take advantage of us and our voices and as you see over there, we're literally seeing someone being arrested for peacefully protesting and sharing their voice," she told CBS Colorado's Jasmine Arenas. "Police tend to escalate things. They continue to not be peaceful within this time and I think they expect us to not be peaceful, but at the end of the day, we chose to stand our ground and be in support of our cause and they don't like that and that won't always be supported but at the end of the day, we continue to show up in support of our community."

Another protester said, "people out here are finding an excuse to be violent and they're burning flags and stuff and that's not right (...) at the same time, it is wrong what's going on right now, we're out here protesting for our people, my grandpa's an immigrant, so I'm out here fighting for my grandpa and they're just making us look bad."

Protests occurred in cities and towns, large and small, across the country, and Colorado saw dozens of protests, including in communities like Boulder, Castle Rock, Golden, Parker, Northglenn, Steamboat Springs, and beyond.

"With hundreds of events still underway, today's No Kings actions have already drawn more than 5 million participants," protest organizers said in a statement. "They brought joy, drums, banners, and faith. They came not to clash-but to claim what is ours: the right to gather, to speak, and to rise. And rise we did-with dignity, love, and powerful resolve. Turnout was overwhelmingly more than initially anticipated. Organizers and local law enforcement reported over 200,000 in New York, over 100,000 in Philadelphia, and in some towns like Pentwater, Michigan saw 400 people join in their small town with a population of 800."