Students, protesting new tuition fees, camped out in the school president's office.
Mayor Michael Bloomberg gave the commencement speech to Cooper Union's graduating students.
About 50 students from the Cooper Union were camped out in school president Jamshed Bharucha's office.
The school's Board of Trustees may consider charging tuition in future years.
Students have accused the cash-strapped university of delaying early admissions decisions.
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