By Tom Balmforth and Maria Kiselyova MOSCOW (Reuters) - Russia's state nuclear agency acknowledged for the first time on Saturday that nuclear workers were involved in an explosion during a rocket engine test that caused a spike in radiation in a nearby city. The agency, Rosatom, said five people killed in the blast were its staff members, and the accident involved "isotope power sources", giving no further details. Russia has given no official explanation for why the explosion of a rocket engine near the White Sea in northern Russia would have caused radiation to spike
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