North Korea has repatriated two South Koreans who were detained in the North for about a month.
The two -- known to be a couple in their 50s -- were returned through the truce village of Panmunjom this morning.
The North said it was sending them back as a humanitarian gesture.
The South Korean government is checking their health and investigating why they crossed the China-North Korea border back in May.
Pyongyang is still holding four other South Koreans captive.
They include Kim Jung-wook, a missionary who was arrested by the regime in 2013, and Joo Won-moon, who voluntarily and illegally entered North Korea two months ago.
Seoul tried to send a letter to Pyongyang last Friday urging the regime to release the four detainees immediately, but the North Koreans refused to accept it.