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The soldier who crossed into North Korea is Private 2nd Class Travis King, officials have told the BBC's US partner CBS News
As previously reported, an official told CBS the soldier was being escorted out of the country for disciplinary reasons and had gone through airport security, but managed to make his way out of the terminal before joining a border tour
A third source, a defence official, later told CBS that the soldier had "wilfully" gone across the border. His motivation remains unclear
In previous reports it was divulged he was being detained into custody for disciplinary actions. We know he later slipped away and was last seen willfully crossing the border into North Korea, laughing.
Reading about that American soldier who has crossed into North Korea. Random question: I wonder how they keep the grass down in the Demilitarized Zone (DMZ)?
A person has spoken to the BBC's US partner CBS News about what they saw when the US national crossed.
The unnamed witness, who was part of the same tour group, says the man "gave out a loud 'ha ha ha'" before he ran in between some buildings in the direction of the North Korean border.
"I thought it was a bad joke at first, but when he didn't come back, I realised it wasn't a joke, and then everybody reacted and things got crazy."
A US national is being held in North Korea after crossing the border without authorisation, the United Nations says
The unnamed person crossed during a border tour, according to the UN Command, which operates the Demilitarized Zone (DMZ) between North and South Korea