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North Korea is reported to have detained a serving US army soldier who crossed the heavily fortified border from South Korea without permission.
The man was on an organised tour of the UN-run zone dividing the two countries.
The crisis comes during a particularly tense time with the North, one of the world's most isolated states. The US tells its citizens not to go there.
A senior US commander said there had been no contact with the soldier.
Admiral John Aquilino Commander of the US Indo-Pacific Command said he was "not tracking" contact with North Korea. He said the soldier had acted willingly by "making a run" but without authorisation, and the incident was being investigated by US Forces Korea.
Hours after the soldier's detention, North Korea launched two suspected ballistic missiles into the nearby sea.
The missile launch, which has been confirmed by South Korea's military, comes as tensions run high on the Korean peninsula. There has been no suggestion that the launch is tied to the soldier's detention.
It is unclear if the man has defected to North Korea or hopes to return. There has been no word yet from the North.
The Pentagon has identified the soldier as Private 2nd Class (PV2) Travis King. In a statement, a Pentagon spokesperson said that PV2 King had been in the army since January 2021.
He is a cavalry scout - a reconnaissance specialist - originally assigned to an element of the army's 1st Armoured Division on a rotation with the US military in South Korea.
According to the BBC's US partner CBS News, PV2 King passed through airport security in Seoul but somehow managed to leave the terminal and get on a tour of the border, from where he crossed over.
