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MIAMI (CBSMiami) — Several people were injured Thursday afternoon when a 150-foot harbor cruise ship crashed into the wharf alongside a San Diego Pier.

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The Adventure Hornblower struck the edge of the waterfront promenade in the Embarcadero area of San Diego Harbor shortly before 1 p.m., according to the city Fire-Rescue Department.

Several potentially serious injuries were reported, fire Capt. Joe Amador said. He says three of those injured in the accident were taken to hospitals.

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Amador says there was apparently a mechanical malfunction that prevented the boat from stopping in time as it was docking.

It’s not immediately known how many people were aboard the vessel.

The 22-year-old three-deck ship offers bay dinner cruises, sightseeing tours and ocean whale-watching outings.

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At last check, a tugboat was working on pulling the vessel away from the pier.