Japan has banned trade with North Korea as part of sanctions imposed on the country over its missile and nuclear programmes as well as the abduction of Japanese nationals.
Investigators raided several places on suspicion of violating foreign exchange regulations, an official from the Kyoto Police Department told AFP, declining to comment further.
According to local media, police raided a Tokyo-based commercial association affiliated with the General Association of Korean Residents in Japan, known as Chongryon, the de-facto North Korean embassy in Japan.
During last month's visit by US President Donald Trump in Tokyo, Prime Minister Shinzo Abe pledged to freeze the assets of North Korean groups and individuals.
The issue of abductions to North Korea is a highly- charged one in Japan, which suspects dozens of people were kidnapped by agents from the isolated country.
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