Four of the 16 crew members on board the vessel have been rescued, while 12 others were still missing, the state-run Xinhua news agency quoted the Chinese Consulate-General in Osaka as saying.
The Japan Coast Guard has set up a response unit and sent three patrol vessels to the area where the accident occurred -- some 400 km north of the Oki Islands in western Japan, it reported.
The Chinese mission has sent a team to the scene to help with the rescue and is keeping contact with the Japan Coast Guard, the report from Tokyo said.
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