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Associated Press
A security man stands in Lubyanka Square, with the main building of the Russian Federal Security Service, former KGB headquarters, in the background, in Moscow, Russia, Tuesday, Jan. 27, 2015. A long-awaited inquiry into the death of former Russian spy Alexander Litvinenko opened Tuesday in London  with the revelation that the KGB agent turned Kremlin critic may have been poisoned with radioactive polonium not once, as authorities initially thought, but twice. (AP Photo/Pavel Golovkin)

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