Columbia University has expelled and suspended students who were involved in a pro-Palestinian demonstration that shut down the main campus library in May, moving more quickly to hand down punishments than it has in the past, university officials announced on Tuesday.

A statement from the university did not say how many students were disciplined, but a person with knowledge of the matter who spoke on the condition of anonymity said that just over 70 students had been punished. Of those, about 60 were suspended, with most suspensions to last for two years, the person said. A handful of students were expelled.