The state's chapter of the American Civil Liberties Union is calling for an independent investigation after police used pepper spray and batons on a group of spectators performing a haka after a high school football game in a small Utah town.

Officers used pepper spray on about a dozen family members, including at least one as young as 4, after the October game in Roosevelt. The group had traveled about 125 miles east of Salt Lake City to watch a relative play his final game for Union High School.

Union lost the game to rival Uintah and finished the season without a victory. Afterward, a group of Polynesian men and boys performed the haka to boost the player's spirits. The haka originated from New Zealand's native Maori culture and has been popularized by rugby players there who chant, beat their chests and gesture aggressively before matches. It is performed at football and rugby games around the world.

Two officers interrupted the dance, using pepper spray and a baton to disperse the group.

An internal investigation by Roosevelt police cleared the officers of any wrongdoing and said their actions were appropriate because they feared a riot was imminent.

"To our disappointment, the police department's findings appear to be anything but objective," the ACLU's Interim Director Joseph Cohn wrote in a letter sent Monday to Duchesne County Attorney Stephen Foote.

The ACLU is concerned that the decision to deploy pepper spray during a cultural ritual may have violated the dancers' constitutional rights, Cohn writes.

He also notes that the police department's report fails to consider a video of the dancers or statements from 15 witnesses who said they did not feel threatened by the dance.

Foote was away from the office and could not be reached for comment. Roosevelt Police Chief Rick Harrison did not return a message.

The officers' reports about the Oct. 20 incident in Roosevelt, a town of about 8,000 residents, said some of the dancers had been yelling obscenities at referees during the game, then danced in front of the only exit from the stadium.

Officer Luke Stradinger apologized in his report for causing "discomfort" to innocent bystanders, but said he wasn't familiar with the dance and was concerned because the group was blocking the only exit from the field for the football teams.

"I have never seen such an event, or even heard of such a thing," Stradinger said.

While Stradinger used pepper spray, Officer Wade Butterfield used a baton to disperse the group. Butterfield said he became worried during the game because some of the people were yelling obscenities at the referees and acting in an unsportsmanlike manner.

"I have seen a riot firsthand and know how dangerous they can be in an instant," Butterfield said. "No more force was used than was necessary to defuse the situation."

The department says officers will be given additional training in cultural diversity and customs.