Two minority student groups at Harvard University have apologized after fake deportation notices circulated on campus frightened students.

Notices from the fictitious “Harvard Special Investigations Unit” warning students that a resident of their dorm had been detained indefinitely were posted by the Harvard Palestine Solidarity Committee and “formally cosigned” by Harvard Concilio Latino, the Harvard Islamic Society, and the Harvard Black Students Association, The Harvard Crimson reported.

“This is not a real notice,” the notice said on the back. “However, we hope that the unsettling nature of this notice allows Harvard community members to reflect on the reality of people who face these kinds of unwarranted disruptions of life in unexplained suspicious circumstances before a state power that can hold ‘suspects’ indefinitely.”

Some students reportedly expressed outrage at the deceitful nature of the notices, prompting two of the four groups involved, the Palestine Solidarity Committee and Concilio Latino, to issues apologies.

Fatima M. Bishtawi, co-president of the Palestine Solidarity Committee, wrote in an emailed statement that she “would like to unequivocally apologize for any trauma and pain provoked by the seriousness of this notice,” The Harvard Crimson reported.

The board of Concilio Latino wrote in a joint statement Monday evening: “[The fliers] are fake, but the effects they may have had on any of you are beyond real and represent something entirely antithetical to what Concilio stands for.”

Concilio Latino said it was not fully aware of the notices’ exact contents before they were distributed.

Leaders of the Black Students Association and Islamic Society did not return The Harvard Crimson’s inquiries.

This is the second time the Palestine Solidarity Committee has come under fire for fake notices, the College Fix noted. In 2013, the group stirred controversy by posting mock eviction notices as a rebuke of Israel’s settlement policies.