Fox News reported on Thursday that North Korea could conduct its sixth nuclear test within several days.
 
The conservative U.S. media quoted unidentified Washington officials as saying that the North is in the final stages of preparing for another nuclear test, adding it could come as early as the end of the month.
 
Fox News said U.S. defense officials saw evidence the regime has completed the digging of new tunnels around its Punggye-ri nuclear test site, but it still has to move more equipment into the area for a possible test
 
The U.S. recently dispatched surveillance aircraft WC-135 Constant Phoenix to Japan, which is used to test the air following nuclear explosions. Fox News quoted a separate U.S. official as saying the aircraft will patrol the area off the Korean Peninsula in the coming days. 

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