ladd keith from the university _ future. ladd keith from the university of _ future. arizona. - more details have emerged about the us soldier who's been detained in north korea after crossing the border without authorisation. us media are reporting that travis king had previously been held in south korea on assault charges and the afp news agency is reporting he spent time in a south korean prison. us officials say he made it across the demilitarized zone between north and south korea while on a tour of the border. commonly known as the dmz, the area is one of the most heavily fortified in the world. king was reportedly being escorted back to the us for disciplinary reasons before he turned around at the airport and joined the tour. a witness said he saw the soldier laughing while running across the north korean border. united states secretary of defence lloyd austin gave a briefing at the pentagon earlier. we believe he is in dprk custody, so we are continuously monitoring and working to notify the soldier's next of kin and engaging to address this incident. in term