The 27 meter long, 341 dwt catamaram passenger ferry allided with the pier at Devonport wharf, Auckland, New Zealand.  The ferry was approaching the pier in calm conditions when it suffered a mechanical breakdown and struck the pier.  Reports state some 15 passengers and crew sustained injuries with 10 persons taken to hospital for treatment. The vessel sustained severe damage with a large gash in the hull above the waterline.  Authorities have detained the vessel while an investigation was launched into the incident.  No reports of pollution released. Witnesses stated they heard a loud bang when the ferry struck. Passengers stated they were thrown off their seats and fell onto the decks.  Many said they suffered only minor cuts and bruises from the incident.