San Francisco firefighters said a call for mutual aid was issued by Brisbane police after the boat was reported capsized about 8 a.m.
The Oyster Point Marina rescue vessel Challenger found 15 people and a San Francisco police launch located three victims, the Coast Guard said on social media. There were no reports of injuries.
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The marina harbormaster, Jim Smith, declined comment.
The SFPD marine unit recovered the boat and oars and returned them to Oyster Point Marina, according to the Coast Guard.