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SAN DIEGO – An investigation was underway Friday into what caused a cruise ship to crash into the seawall near its dock along the downtown San Diego water front, injuring three passengers.

The Adventure Hornblower hit a concrete wall while docking near North Harbor Drive around 1 p.m., according to San Diego Harbor Police.  Three of the 139 passengers aboard the ship complained of back pain and were taken to a hospital.  Four other people were evaluated by medical staff, but didn’t need further care.

A mechanical malfunction was to blame for the crash, officials told FOX 5.

The Coast Guard responded and determined nothing hazardous had spilled into the water and Harbor police and engineers secured the seawall.

Port officials said crews would work diligently to repair the seawall and barrier railings as soon as possible.

The 22-year-old three-deck ship offers bay dinner cruises, sightseeing tours and ocean whale-watching outings.  The amount of damage to the Hornblower was not immediately known.