About 600 people have been arrested at pro-Palestinian protests on at least 15 college campuses across the U.S. in just over a week.

Why it matters: University administrations have cracked down on student demonstrators in unprecedented ways as protests grow in size and intensity.

• The majority of arrests have occurred at encampments and sit-ins. Dozens of smaller-scale college protests haven't seen altercations between demonstrators and police.

Catch up quick: Students set up an encampment on Columbia's campus on April 17 after the university's president, Minouche Shafik, testified before Congress.