The Chosunilbo reports:
The U.S. Air Force moved a WC-135 Constant Phoenix reconnaissance jet from the U.S. mainland to the Kadena Air Base in Okinawa, in September in preparation for another nuclear test by North Korea, the Sankei Shimbun reported Tuesday.
The WC-135, a modified aircraft, is able to detect nuclear explosions from the air by collecting samples from the atmosphere. It was stationed in Okinawa about a month before North Korea carried out its second nuclear test in May 2009. Apparently the U.S. believes that another nuclear test is imminent after unusual movements were detected at the North’s test site.