Japan says Iran has detained a Japanese citizen in Tehran since January and it is demanding the person's quick release.

Japanese officials say embassy staff remain in contact with two detained citizens in Iran while urging authorities to release them.

Tokyo says that a Japanese national has been detained in Tehran and that it has “strongly demanded” Iranian authorities ...

Iran has detained NHK Tehran bureau chief Shinnosuke Kawashima and transferred him to Evin Prison as Japan urges his release.

For Japan, the crisis is not only about energy security. It also strikes at the heart of the country’s moral and strategic identity.