Nuclear test monitors in Vienna say the underground explosion had double the force of the last test, in 2009, despite the use of a device said by the North to be smaller.
Nuclear test monitors based in Vienna say the underground explosion had double the force of the last test, in 2009, despite the use of a device said by the North to be smaller.
Warheads will be tested by technical means to ensure their safety and effectiveness, without having to test them by explosion.
The explosion also posed the first test of the promise by Kevin Rudd, the Labor prime minister, of a more humane approach to refugees.
North Korea had built up expectations for the explosion for months by launching rockets to test missile technology and then undertaking a propaganda campaign, a pattern seen in both 2006 and 2009.
The case of Sheila Henry, whose son, Christian Small, was killed in the 2005 Russell Square explosion, will be one of six test cases for civil damages claims against News Group Newspapers over phone-hacking claims.
But in 1963 the Limited Test Ban Treaty prohibited any nuclear explosion that sent radioactivity over a nation's borders.
Pyongyang is angry about ongoing U.S.-South Korean military drills and about new U.N. sanctions, issued over the North's December long-range rocket launch, which the U.N. called a cover for a banned missile test, and its third underground nuclear explosion, conducted Feb. 12.
The Halliburton information also disclosed an additional test in early April, prior to the explosion, that involved the same mix that was used on the Macondo well and also found it to be unstable, the letter said.
North Korea confirmed the test after international monitors recorded seismic activity consistent with a powerful underground explosion at 11:57 (02:57 GMT) on Tuesday.
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Mr Tallents took his children to hospital to check them for glass cuts and to test whether their hearing had been affected, so loud was the explosion.
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The markets seem likely to re-test recent lows, and if key technical levels are broken, an explosion in selling is possible.
Analysts are still poring over intelligence data on the North Korean test, trying to determine the size and cause of the North Korea explosion.
Baskar Vairmohan, the EPRI researcher who conducted the iPad test, said the group is now studying usage to understand whether the explosion of tablets is adding to power consumption or reducing it.
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