SAN FRANCISCO — A gunman opened fire at a group of fighting men, injuring 12 people outside a concert hall, authorities said Monday.

The gunfire erupted Sunday night near the Regency Ballroom after several men were involved in a fist fight, San Francisco police Sgt. Wilfred Williams said. The victims were taken to hospitals with non-life threatening injuries.

At some point, a man standing near the fighters opened fire in their direction before running away, police said.

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