North Korea is not responding to attempts to negotiate the release of a US soldier who fled over its heavily-armed border, Washington says.
Private Travis King crossed the Demilitarised Zone (DMZ) dividing North and South Korea on Tuesday.
The US has tried to contact North Korea's military through "multiple channels", the White House said.
The US was still trying to ascertain the soldier's whereabouts and wellbeing, a spokesperson added.
The crisis comes during a particularly tense time with the North. Relations with the US have plummeted in recent years, as it has tested dozens of increasingly powerful missiles capable of carrying nuclear warheads.
On its travel advisory, the US tells its citizens not to travel to North Korea - one of the world's most isolated states - due to "the continuing serious risk of arrest" and the "critical threat of wrongful detention".
It is unclear if PV2 King has defected or hopes to return.
Experts say such a low-ranking soldier would have little propaganda and intelligence value, which may prompt North Korea into releasing him - but what will happen to him remains highly uncertain.
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