China says an abnormal level of radiation was detected on a Japanese merchant vessel when it arrived at a port in eastern China.
The General Administration of Quality Supervision, Inspection and Quarantine said on its website Friday the radiation was found on the Mol Presence when it arrived at Xiamen port on Monday.
The ship belongs to Japanese transport company Mitsui O.S.K. Lines and left Tokyo on March 17.
The Chinese watchdog's statement did not give further information about the exact levels of radiation, the ship crew or cargo.
A nuclear power plant in northeast Japan has been leaking small amounts of radiation since being damaged in the March 11 earthquake and tsunami.