Chinese authorities on Monday arrested a Japanese citizen suspected of spying.

According to local state media, the arrest was made in the port city of Dalian in the northeastern Liaoning province.

The report said Ken Higuchi is being investigated by the Dalian City National Security Bureau on suspicion of spying against China, and that prosecutors had approved his arrest.

The character given for Higuchi’s first name could also be the names Takeshi or Takeru.

It was unclear from the report, however, whether Higuchi was a new case or whether he had been detained earlier, and the latest development was his formal arrest.

Reuters was unable to contact Japan’s foreign ministry by telephone. Monday was a national holiday in Japan.

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