SEOUL, South Korea (AP) — A news report says South Korean authorities have indicted a Christian activist who made an unapproved visit to North Korea.

Yonhap news agency says the Rev. Han Sang-ryol was indicted Thursday under the National Security Law for allegedly meeting North Korean secret agents and praising the North during his 70-day visit.

Prosecutors were not available for comment.

Han was detained last month as he returned home across the heavily fortified border with North Korea.

He could face up to seven years in prison if convicted of violating the security law, which bans citizens from having unauthorized contact with North Korea and supporting its communist regime.

A separate law bars citizens from visiting the North without government permission.