At least 10 students who were accepted to Harvard University had their admission offers revoked because they made offensive comments online, the university’s student newspaper, The Harvard Crimson reports.

The newspaper reported that some students in the incoming freshman class created a private Facebook group in December where they traded images and messages that were often sexually explicit and sometimes mocked racial minorities. One commentor called the hypothetical hanging of a Mexican child “piñata time,” others made jokes about the Holocaust, sexual assault and child abuse.

Harvard spokeswoman Rachael Dane declined to comment, saying Harvard doesn’t discuss the admissions status of individual applicants. The university tells accepted students that their offers can be withdrawn if their behavior brings into question their honesty, maturity or moral character, among a variety of other reasons.

Students had created the Facebook group as a spinoff from a 100-member group created for the Class of 2021. The Crimson says students were required to post provocative memes in the bigger group before being allowed into the smaller one, which was at one point called ‘Harvard memes for horny bourgeois teens.’

In April, Harvard admissions officials sent letters to some members of the group asking them to explain their offensive posts, saying their admission was under review and that they shouldn’t attend Harvard’s freshmen visiting event in April,. About a week later, at least 10 were told their offers were withdrawn, the student newspaper reported.

AP