In a shocking incident that has sparked international concern, a U.S. soldier has been detained in North Korea after crossing into the country from South Korea without authorization. The soldier, identified as Private 2nd Class Travis King, is believed to be in the custody of North Korean forces, according to U.S. and international officials.

King was part of a group touring the Joint Security Area (JSA), a heavily guarded region that separates North and South Korea. The United Nations Command, which operates the JSA within the Demilitarized Zone (DMZ), confirmed the unauthorized border crossing. "A U.S. National on a JSA orientation tour crossed, without authorization, the Military Demarcation Line into the Democratic People's Republic of Korea (DPRK). We believe he is currently in DPRK custody and are working with our KPA counterparts to resolve this incident," the organization stated in a tweet.

According to U.S. officials, King had recently served time in a South Korean prison on assault charges and was released about a week ago. He was being escorted to the U.S. for additional disciplinary actions when he allegedly separated himself from his escort at the airport. King then joined the group touring the JSA and ran across the border, causing a sudden and unexpected incident.

A witness from the same tour group recounted the event to CBS News, stating that King gave out a loud laugh and ran between some buildings. The witness initially thought it was a bad joke until King didn't return, leading to a swift reaction from the group and military personnel.

The detainment of King marks the first American detainment in North Korea in nearly five years and comes at a time of heightened tension between the U.S. and North Korea. The latter has been testing ballistic missiles, alarming Western officials. The U.S. State Department has warned U.S. nationals against entering North Korea due to the serious risk of arrest and long-term detention.

This incident serves as a stark reminder of the case of Otto Warmbier, a University of Virginia student who was sentenced to 15 years of prison and hard labor in North Korea for allegedly stealing a political propaganda poster. Warmbier was released back into U.S. custody in a coma and died days after his return in 2017.

The U.S. military in South Korea confirmed King's unauthorized crossing and stated they are closely monitoring and investigating the situation. The incident underscores the ongoing risks and tensions in the region, with the welfare of the detained soldier now a primary concern for U.S. officials.