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A great white shark bit a man in the leg as he swam off a Northern California beach on Saturday morning, authorities said.

The 35-year-old man’s injury was not life threatening and he was able to swim to shore at Grey Whale Cove State Beach, about 18 miles south of San Francisco, where he received medical aid, San Mateo County Sheriff’s Lt. Eamonn Allen said.

The man said he believed he was bitten by a 6- to 8-foot-long great white shark, Allen said.

Authorities shut access to the beach as a precaution.