The United States has released a statement that confirms there was some sort of nuclear device tested in North Korea last week. It was relatively small, and still may have been a fizzle.
In a short statement posted on its Web site, Negroponte's office also confirmed that the size of the explosion was less than 1 kiloton, a comparatively small nuclear explosion. Each kiloton is equal to the force produced by 1,000 tons of TNT.
"Analysis of air samples collected on October 11, 2006, detected radioactive debris which confirms that North Korea conducted an underground nuclear explosion in the vicinity of P'unggye on October 9, 2006," the statement said.
Proof of concept or fizzle, the threat is the same at this point.