Riot police stormed the Sorbonne University early Saturday to push out student protesters occupying the building. About 80 helmeted police officers moved students into an inner courtyard under the famed dome of the centuries-old institution and, after a brief standoff, forced them out. Up to 600 students had entered the building Friday to join a sit-in that began Wednesday. By Friday night, ladders, chairs and other heavy objects were hurled from windows, and police replied with tear gas. The disturbances were part of snowballing protests over a new jobs measure that are posing a major test to the government.