An NBC report said that a US source confirmed that a pre emptive strike could be launched if there is sign of a nuclear test.
That report has been challenged saying that only retaliation after a test.
The carrier group is not there, but the US has 2 destroyers in range and B2 Stealth Bombers in Guam.
North Korea said that something big is planned tomorrow Saturday 15 and there would be merciless retialiation in case of interference.
They also evacuated 600,000 people from the capital.
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