The Japanese government suspects that North Korea has conducted a second nuclear test, a government official said late Tuesday night.
Pyongyang drew global condemnation after claiming Monday that it had successfully tested a nuclear device.
The Japanese government was trying confirm Tuesday night if the North had conducted a second nuclear test, a Foreign Ministry official said on condition of anonymity, citing protocol.
Earlier, US Secretary of State Condoleezza Rice said the US had no plans to attack North Korea.
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