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TOKYO — A Japanese Maritime Self-Defense Force sailor is being investigated for possessing classified Japanese and U.S. military information, according to a Kanagawa prefectural police spokesman.

The sailor, a petty officer second class based at a Japanese defense facility in Yokosuka, was found in January to have the information at his home, according to Japanese media reports. Some of the information included data on Aegis, a defense missile system used by the U.S. Navy, according to Kyodo News.

Japanese military officials and local police are working the investigation, the prefectural police spokesman said. Japanese defense officials declined to release additional information on Thursday, as did local Japanese police.

A spokesman for U.S. Forces Japan said the American military is letting the Japanese take the lead in the investigation.

According to Kyodo News, the Japanese sailor’s home was searched in January because his Chinese wife was suspected of violating immigration law.

During that search, hard drives and other storage media containing Aegis destroyer radar data and frequencies were discovered, Kyodo reported.

The petty officer is assigned to the destroyer Shirane, which is part of the 1st Escort Flotilla based in Yokosuka. The sailor is not authorized to access such data, Kyodo reported.

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