By Da Lin

OAKLAND (CBS) — A large pro-Palestinian demonstration in West Oakland Saturday was infiltrated by protesters angry over the police shooting of Michael Brown, an unarmed teen, in Missouri.

The pro-Palestinian supporters were rallying to stop an Israeli ship from unloading at the Port of Oakland.

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Police said a group of people they believe to be anarchists, carrying weapons, merged into the rally and began taunting officers, calling them “pigs” and “murderers.”

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Protest organizers and officers tried to keep the demonstrators under control in light of the violence the night before during a march to support the people of Ferguson, the city where Brown was killed. Protesters vandalized businesses and one officer was hospitalized.

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Fortunately, there were no such incidents on Saturday. Most of the demonstrators were gone by 7 p.m.