Thousands of protesters in Oakland, California, shut down the nation’s fifth-largest port on Wednesday as part of a general strike called by the Occupy Oakland movement. It was the first general strike called in the city since 1946. While the city remained open despite the strike, many businesses shut down. Nearly 20 percent of the city’s teachers did not report to work. While the strike was largely peaceful, tension escalated overnight. Police arrested at least three dozen people and repeatedly fired tear gas and other projectiles to break up late night protests.