The search began around 4:15 a.m., when the Coast Guard received a distress signal from a 30-foot sailing vessel named Alma. An air crew and a boat crew were dispatched to search the area.
The Coast Guard was later notified that a boat had washed up on the rocks in Yellow Bluff, just north of the Golden Gate Bridge. The vessel, which was determined to be the same one that had issued the distress signal, later sunk.
The Southern Marin Dive Team and National Park Service are aiding in the search for possible persons in distress.
"We are using every asset available to locate any possible persons in distress," said Cmdr. Donald Montoro, Coast Guard Sector San Francisco chief of response. "We are asking the public if they have any information on the Alma or its operator to contact the Sector San Francisco Command Center at 415-399-3520."