Japanese public broadcaster NHK issued a false alarm about a North Korean missile launch on Tuesday, just days after a similar gaffe caused panic in Hawaii, but it managed to correct the error within minutes.
It was not immediately clear what triggered the mistake.
"We are still checking," an NHK spokesman said.
NHK's 6.55 p.m. alert said: "North Korea appears to have launched a missile ... The government urges people to take shelter inside buildings or underground."
The same alert was sent to mobile phone users of NHK's online news distribution service.
In five minutes, the broadcaster put out another message correcting itself.
Regional tension soared after North Korea in September conducted its sixth and largest nuclear test and in November said it had successfully tested a new type of intercontinental ballistic missile that could reach entire US mainland. It regularly threatens to destroy Japan and the United States.
There were no immediate reports of panic or other disruption following the Japanese report.
Human error and a lack of fail-safe measures during a civil defence warning drill led to the false missile alert that stirred panic across Hawaii, a state emergency management agency spokesman said.
Elaborating on the origins of Saturday's false alarm, which went uncorrected for nearly 40 minutes, spokesman Richard Rapoza said the employee who mistakenly sent the missile alert had been "temporarily reassigned" to other duties.
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