South Korean prosecutors say they have indicted five men on charges of spying for North Korea.

The prosecutors said Thursday the five belonged to an anti-state organization named after a North Korean mountain, and have been passing sensitive information to North Korea's intelligence agency for more than a decade.

They said the information they passed included satellite photos of South Korean military bases, U.S. military field manuals and information on South Korean politicians.

A conviction under South Korea's national security law carries the possibility of capital punishment.