Four people from the Japanese tour boat that went missing with 26 people on board had been found early on Sunday, Japan's coast guard said, although it was unclear if they were still alive, APA reports citing Reuters.
Three were discovered by a police helicopter near the tip of the Shiretoko peninsula, early on Sunday morning, the coast guard said, with the fourth spotted by a coast guard aircraft in the same area about 30 minutes later.
The condition of the four people was unknown, and it was not clear whether they were on land or still at sea when found.
A coast guard official had no further information.
Authorities were using aircraft and patrol boats to search for the passengers and crew of the "Kazu I" after it ran into trouble off the peninsula, which is famous for its wildlife and dramatic coastline.