Thirty-one members of the national white supremacist group Patriot Front were arrested Saturday in Coeur d’Alene, Idaho, and charged with conspiracy to riot, a misdemeanor, according to police.

In a news conference Saturday, Police Chief Lee White said a concerned citizen reported “a little army” of about 20 people wearing masks and holding shields loading into a U-Haul truck. Police pulled over the truck about 10 minutes later, White said.

Police received reports that groups planned to disrupt LGBTQ Pride activities planned for the weekend, White said, leading to a heavy police presence in downtown Coeur d’Alene, about 30 miles east of Spokane, Washington.

Experts on extremism identified the suspects as members of Patriot Front, which often engages in propaganda efforts, such as putting up posters and making videos, and “flash mob” events, where identically dressed members march around shouting slogans and waving flags.   

Here’s what we know:

Who was arrested in Idaho?

Within hours of the arrests, the Kootenai County Sheriff’s Office released booking photos and names for 31 men from Texas, Wyoming, South Dakota, Washington, Colorado, Arkansas and other states. Most of them appeared to be white men in their 20s and 30s.

Each man was charged with one count of conspiracy to riot, White said, stressing more charges could come.

“They came to riot downtown,” White said at the news conference.

The founder of Patriot Front, Thomas Rousseau, 23, of Texas, was among the 31 arrested.

All of the suspects bonded out of jail and were scheduled to be arraigned in the coming weeks, Kootenai County 1st District Trial Court Administrator Karlene Behringer told USA TODAY.

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What is Patriot Front?

According to the Anti-Defamation League’s Center on Extremism, Patriot Front is responsible for approximately 80% of white supremacist propaganda across the USA. Members put up flyers and hang banners.

“Patriot Front espouses racism, antisemitism and intolerance under the guise of preserving the ethnic and cultural origins of their European ancestors,” ADL Vice President Oren Segal said. “They essentially believe that this is their country and they need to fight for the perception of what it was.”

The group, founded in 2017 by Rousseau, regularly produces videos with a distinctive red-white-and-blue aesthetic that are posted to its various social media platforms. The videos often feature men marching, training, putting up stickers and hanging flags.