Hundreds of graduates walked out of a commencement ceremony at Harvard University on Thursday, calling for an end to the war in Gaza and decrying the disqualification of students involved in earlier protests.

A day earlier, it was announced that 13 students who had participated in a pro-Palestinian encampment on campus would not be allowed to receive their diplomas along with fellow graduates.

According to the Associated Press, groups of students walked out of the commencement chanting “Free, free Palestine” and “Let them walk, let them walk,” in reference to the graduates barred from participating in the ceremony.

Harvard said on Wednesday that one of its two governing boards overruled faculty members, who had voted to re-invite 13 student protesters omitted from commencement.

Student speakers at the ceremony strongly criticized the decision, deviating from their prepared remarks to voice support for their disqualified peers.