A student at Central Michigan University in Mount Pleasant, Mich., has admitted to hanging nooses in a university classroom, campus police said Saturday.

The student called police Saturday morning to confess to fashioning the hate symbols from flexible compressed-gas line used for laboratory work. The nooses were found Nov. 12.

“Whether it was meant as a prank or not, it was still the type of action that we find deplorable,” CMU spokesman Steve Smith said Saturday. “We will use this as an opportunity to continue discussions about diversity and inclusion of everybody in America.”

Campus Police Chief Stan Dinius said in a news release that his department is completing its investigation and forwarding information to the Isabella County Prosecutor’s Office.

In October, someone posted flyers containing slurs against American Indians. A few weeks later, somebody slipped flyers condemning Islam under several professors’ doors.

Administrators responded by scheduling a diversity forum for Nov. 27.

“I think it’s bigger than just one student,” said Kierre Majors, an African American junior from Detroit who is president of Students Against Discrimination.

“Our university tries to promote diversity, but maybe we’re not doing something right. There should be no way that these individuals feel comfortable enough to commit these hate crimes.”

The Rev. Charles E. Williams II of Detroit helped organize a 30-student rally on campus earlier this week. “We need to make sure that we set a precedent for any young people who feel like they can do this as a prank anywhere in the country,” he said Saturday.