Hundreds of protesters swarmed UC Berkeley on Thursday evening as conservative writer Ben Shapiro spoke on campus, with law enforcement out in force to prevent a repeat of recent violent clashes between far-left and far-right agitators.

Nine people were arrested, four of them for carrying banned weapons. One was held on suspicion of battery on a police officer. Hundreds of law enforcement officers, many in riot gear, prepared for violence and seized potential weapons, but no major skirmishes were reported. Several shouting matches erupted but ended peacefully.

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