A group of men in the US state of Colorado dressed as Charedim were seen last weekend handing out leaflets denying the Holocaust and blaming Jews for both pornography and the slave trade.

Pictures broadcast on local television station Denver 7 showed the men emerging from a van covered in antisemitic slogans in the town of Boulder, northwest of the state capital Denver.

An unnamed man is heard saying in the video: “We want to wake up all races to the Jews. Holo-hoax.”

One of the group dons a kippah and a tallit and proceeds to a local high street, where he begins to hand out index cards and the leaflets containing the header: “It is statistically impossible for six million Jews to have died in World War II”.

The flyer continued: “the alleged gas chambers had wooden doors, many of which locked from the inside.”

It also repeated the widely debunked claim that Zyklon B, the chemical pesticide used by the Nazis in the gas chambers “was a delousing agent to combat the Typhus outbreak at the camps caused by the allied forces [sic] — not for the purpose of gassing Jews.”

The men reportedly live-streamed their actions in Boulder online and later left the area without incident.Police said the group’s actions were peaceful and they could take any action because no crime had been committed.

But Scott Levin, a regional director for the Anti-Defamation League, told the broadcaster it was “just a vile, terrible thing.”

“We think several of these people are white supremacists that have been around town and have been doing provocative actions, many different ways. This is just the last one,” he said.

“To think somebody would spend that much energy and that much effort to display their hate of Jewish people is just sickening.”

Colorado University student Tyler Bernstein, who is Jewish, added: “Putting other people down isn’t a way that we can progress and move forward throughout society and throughout the world.”

An ADL report published earlier this year found antisemitic incidents in the state remained at “near-historic levels”, with 28 cases of harassment and threats and 11 cases of vandalism.