The Senshomaru was later found on the seabed at a depth of 30 meters near the site of the collision, and the body of one of the missing crew members was found inside, Japan's Jiji Press and Kyodo News reported.
All four crew on the 499-tonne Sumihomaru were safe after the collusion. There were no details immediately available about the scale of the damage it had suffered, officials said.
The Coast Guard launched five patrol vessels, a helicopter, and a special search-and-rescue unit to find the missing men, while another special unit was working to contain the oil leak, Kawaguchi said.
The captain and the missing crew members are all Japanese men, he added.
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