Nearly 2,200 people have been arrested during pro-Palestinian protests on US college campuses

Police have arrested nearly 2,200 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 said.

No one was injured by the officer's mistake late Tuesday inside Hamilton Hall on the Columbia campus, the NYPD said Thursday. He was trying to use the flashlight attached to his gun at the time and instead fired a single round that struck a frame on the wall.

There were other officers but no students in the immediate vicinity, officials said. Body camera footage shows when the officer's gun went off, but the district attorney's office is conducting a review, a standard practice.

More than 100 people were taken into custody during the Columbia crackdown, just a fraction of the total arrests stemming from recent campus protests over the Israel-Hamas war. A tally by The Associated Press recorded at least 56 incidents of arrests at 43 different U.S. colleges or universities since April 18. The figures are based on AP reporting and statements from universities and law enforcement agencies.

Early Thursday, officers surged against a crowd of demonstrators at University of California, Los Angeles, ultimately taking at least 200 protesters into custody after hundreds defied orders to leave, some forming human chains as police fired flash-bangs to break up the crowds. Police tore apart a fortified encampment’s barricade of plywood, pallets, metal fences and dumpsters, then pulled down canopies and tents.

Like at UCLA, tent