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South Korea is aware of signs related to possible preparations for an additional North Korea nuclear test, a government official said.
The official said various intelligence reports were coming in about a possible test, but that it was unclear how reliable they were.
Seoul has already taken measures to be more vigilant for a possible second nuclear test by North Korea, and was bolstering exchanges of intelligence with the United States, the official said, speaking on condition of anonymity because of the sensitivity of the information.
In Tokyo, Japanese government said it had "information" concerning media reports that North Korea could be preparing for a second nuclear test.
"We have information but I cannot speak about its contents," Foreign Minister Taro Aso told reporters, without elaborating.
US media, including ABC and NBC, reported earlier that US spy satellites have picked up signs, including suspicious vehicle movements, that North Korea may be preparing to conduct a second nuclear test after the first one on Oct. 9.