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(CNN) -- Thirty to 40 ships -- including several passenger ships -- were stuck Thursday in ice off the coast of Sweden, said a spokesman for the Maritime Search and Rescue Center in Gothenburg, Sweden.
The area of the Baltic Sea worst hit by the ice were the waters bounded by mainland Sweden, the Stockholm archipelago and the Finnish island of Aland, said Tommy Gardebring, press officer with the Swedish Maritime Administration.
The center identified one of the passenger ships as the Amorella, with 753 passengers and 190 crew members.
U.S. Coast Guard Cutters Neah Bay, homeported in Cleveland; Penobscot Bay, homeported in Bayonne, N.J.; Hollyhock, homported in Port Huron, Mich.; and Bristol Bay, homeported here, are working together to break the ice jam and allow vessels to transit the area.