More than 2,100 arrests made during pro-Palestinian protests at US colleges

Dozens of tents were in place as part of a pro-Palestinian protest at the University of Michigan (Ed White/AP)

Police have arrested more than 2,100 people during pro-Palestinian protests at college campuses across the United States in recent weeks, sometimes using riot gear, tactical vehicles and flash-bang devices to clear tent encampments and occupied buildings.

One officer accidentally discharged his gun inside a Columbia University administration building while clearing out protesters camped inside, authorities disclosed on Thursday.