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A San Francisco man who tried to intervene when his friend was being harassed was stabbed with a kitchen knife Wednesday outside a grocery store in the Mission District.

The victim, age 30, had just exited the store about 4:30 p.m. when he saw an apparently intoxicated man harassing his female friend, a store employee. The suspect, a 57-year-old man also of San Francisco, was being “vulgar and rude,” said Officer Carlos Manfredi, a police spokesman.