A 32-year-old San Francisco man was knocked unconscious and left with a fractured skull Saturday night just a few blocks from the historic Fisherman's Wharf after he was attacked by six men, police said.

San Francisco police said they responded to a robbery report in the city’s North Beach neighborhood around 10:36 p.m.

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SFGate reported that the six suspects approached the victim from behind and knocked him unconscious before taking his backpack and phone.

The victim was taken to a hospital in critical condition, the report said. His identity was not released.

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Authorities have made no arrests in connection with the attack, the report said. Details of the suspects were not immediately released, KNTV reported.