Russia's meteorological service has reported “extremely high pollution” of a radioactive isotope in the Urals near a facility that previously suffered the third worst nuclear catastrophe in history. The news bolsters international reports that a ruthenium-106 leak originating in the Urals sent a radioactive cloud over Europe. Greenpeace Russia has said it will ask the prosecutor general to investigate the possible cover-up of a nuclear accident. Rosatom, Russia's state nuclear company, said in a statement to The Telegraph on Tuesday there had been "no unreported accidents" and the ruthenium-106 emission was "not linked to any Rosatom site". Its Mayak facility,...