At least twelve people died Thursday when their tour boat sank in Halong Bay, one of top tourist destinations in Vietnam, officials said. Most of the dead are foreigners. The boat sank when the tourists were sleeping. Talking to reporters, Vu Van Thin, a local government official in Quang Ninh province, said that the 12 dead included 10 foreigners and two Vietnamese. The local immigration police said that the foreign victims were believed to comprise two Americans, two Russians, two Swedes, and one each from Britain, Japan, France and Switzerland.