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US and UK conduct subcritical nuclear tests

On 23 February, the US and UK carried out a ‘sub-critical’ nuclear test at the Nevada underground testing site. The test, conducted by Los Alamos National Laboratory and the Atomic Weapons Establishment (AWE) Aldermaston, took place in a laboratory of horizontal tunnels about 290 metres underground. It was the first since May 2004, the ninth under the Bush administration, and the second carried out with Britain since a joint test in February 2002.