Stinson Beach shark sighting prompts warning

June 20, 2011 12:00:00 AM PDT
Beachgoers in Marin County are being warned to stay in shallow waters through Thursday after a shark was sighted near Stinson Beach.

Sunday's sighting was a mile north of Stinson at Seadrift Beach.

Shark warning signs have since been posted along all Southern Marin County beaches. People are being told not to go into the water past their knees.

Officials say that warning could be extended if more sharks are spotted.