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As the volunteers assembled to patrol a neighborhood rattled by violence, Katrina Ramos gave a quick tutorial.

People who need help will not always say so, Ramos said.

Study their faces — do they look lost or confused? Maybe a senior citizen carrying heavy groceries might appreciate you hovering nearby, said Ramos, co-founder of Compassion in Oakland.

About 30 volunteers showed up on a recent Saturday afternoon to accompany pedestrians to their destinations in Oakland’s Chinatown after a spate of attacks on elderly Asian Americans.

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