Troops at a US military base in South Korea heard an emergency siren instead of a bugle tune on Thursday, sparking fears of a North Korean attack.
A military spokesman blamed "human error" at Camp Casey, the closest US base to the border with the North.
North Korea had warned it could send a "Christmas gift" to the US to force concessions over stalled nuclear talks.
US President Donald Trump has refused to lift sanctions over the country's nuclear programme.
Separately, early on Friday Japan's public broadcaster NHK mistakenly reported that North Korea had fired a missile that landed in the sea off the Japanese coast.
NHK showed the newsflash on its website just after midnight local time but corrected the error 20 minutes later and apologised, saying the newsflash had been for "training purposes".
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