TOKYO: Rescuers said that 10 people who were retrieved Sunday from the frigid sea and the rocky coast of a northern Japanese national park had died, a day after a tour boat with 26 aboard apparently sank in rough waters, triggering questions why it was allowed to sail.

The search for the others is still ongoing after the boat sent a distress call on Saturday afternoon saying it was sinking. The location, near the Kashuni Waterfall, is known as a difficult place to maneuver boats because of its rocky coastline and strong tide.