Police are investigating suspected illegal hazing after about 30 partially clothed young men covered in food, condiments and other liquids were found recently in the basement of a fraternity house near the University of Wisconsin-Madison campus.

Madison police said some of the men, whom they described as pledges of a fraternity, had signs of being physically assaulted.

Police went to the Alpha Epsilon Pi (AEPi) fraternity house on Wednesday night after receiving an anonymous tip. Two fraternity members, both 20, were arrested on tentative misdemeanor charges of hazing and disorderly conduct, police said. No formal charges had been filed against them as of Friday morning.

The university said it was taking the case seriously and launching its own investigation.

“UW–Madison is fully committed to preventing and addressing hazing and takes all incidents involving our community seriously,” the university said in a Thursday statement.

Any student found to have broken the law or university policy could be subject to sanctions ranging from a written reprimand to expulsion, UW-Madison said.

Police released a photo that shows about two dozen men, all shirtless, in the basement of the fraternity with trash and other debris on the ground. The faces of the people in the photo are blurred out.

Police said the thermostat had been set to 81F, causing hot and humid conditions in the basement, where the walls appeared to be painted black. A majority of people in the basement were 18 years old, police said.

The fraternity’s status as a recognized student organization on the Madison campus was terminated in 2015 for holding events while suspended. It had been suspended in 2013 for hosting a party in which a 17-year-old and another person were taken to detox after being served alcohol at a party hosted by the fraternity, according to university records.

The termination came after a fourth incident involving either events, alcohol or both, the university said.

Since 2016, there were seven additional allegations involving the fraternity related to intramural sports, disrespectful behavior, drinking and hazing, the university said.

Because the fraternity is still recognized by its national organization, it is able to operate as a fraternity chapter unaffiliated with the university, UW-Madison said.

National fraternity spokesperson Jon Pierce said his organization is taking the allegations “very seriously” and will cooperate fully with investigations. Any member found to have participated will be expelled from the fraternity, he said.

“Hazing is a betrayal of everything our fraternity stands for,” Pierce said. “There is no place for it in AEPi. No exceptions. No excuses.”

The fraternity house is located just blocks from the heart of the UW-Madison campus, which is home to about 52,000 students.

Police said their investigation is also ongoing. The university’s office of student conduct and community standards is also investigating in accordance with its nonacademic misconduct process, UW-Madison said.