Fans at a North Dakota High School State Hockey Semifinal were photographed wearing KKK hoods and white face paint in the bleachers during the game on Friday.
The Ku Klux Klan fans were busted when 19-year-old Shane Schuster noticed something strange in the student section during at Ralph Engelstad Arena during the matchup between Grand Fork's Red River High School and Fargo's Davies High School.
"I thought, 'Are those KKK hoods?' I couldn't believe it," Schuster told the Associated Press. "I was shocked."
He took a photo of the fans wearing the KKK hoods and posted it on Twitter with the caption "I guess the red river highschoolers are racist?"
The photo provoked an outcry on the social networking site.
"That is despicable," tweeted Pat Sullivan.
"This. Cant. Be. Real," tweeted Tom Miller.
"Not a proud alum," Miller wrote 30 minutes later.
Red River High School student Meghan Knoell stuck up for her school on Twitter.
"Correction: THREE of red rivers students thought it would be funny [to wear KKK hoods]," Knoell wrote. "Just because they did it doesn't mean our school agrees."
"We, as a school, are extremely disappointed with the behavior of these three students," Red River Principal Kristopher Arason said in a statement to The Associated Press on Saturday.
He said most students at the school would never wear such incendiary clothing.
"This behavior is not a representation of our school or student body," Principal Arason said.
Arason said an investigation of the incident found that the racist hockey fans wore the KKK hoods for 30 seconds after their team scored their first goal. He said administrators and the KKK fans' parents were notified about the hoods after the game.
"Appropriate action is being taken," he said.
Arason would not indicate whether disciplinary action would be taken against the Ku Klux fans.