Did North Korea Conduct Two Covert Nuclear Tests In 2010?

Isotopes Hint At North Korean Nuclear Test -- Nature

Data suggest that the country has experimented with a fusion boost to its fission weapons.

North Korea may have conducted two covert nuclear weapons tests in 2010, according to a fresh analysis of radioisotope data.

The claim has drawn skepticism from some nuclear-weapons experts. But if confirmed, the analysis would double the number of tests the country is known to have conducted and suggest that North Korea is trying to develop powerful warheads for its fledgling nuclear arsenal.

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My Comment: No collaboration on this report from any sources .... so I guess we will have to wait for North Korea to tell us if nuclear tests were conducted, or not.