Police cleared a pro-Palestinian tent encampment at the University of Chicago on Tuesday as tension ratcheted up in standoffs with demonstrators at other college campuses across the U.S. — and increasingly, in Europe.

Nearly three weeks into a movement launched by a protest at Columbia University, the Rhode Island School of Design held talks with protesters occupying a building, and MIT dealt with a new encampment on a site that was cleared but immediately retaken by demonstrators.

The confrontations come as campuses try a range of strategies, from appeasement to threats of disciplinary action, to resolve the protests against the Israel-Hamas war and clear the way for commencements.