The explosion also posed the first test of the promise by Kevin Rudd, the Labor prime minister, of a more humane approach to refugees.

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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.

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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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But in 1963 the Limited Test Ban Treaty prohibited any nuclear explosion that sent radioactivity over a nation's borders.

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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.

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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.

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