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'Radioactive Drone' Discovered on Prime Minister's Office RoofNBCNews.comNBC News Tokyo police said object found by security staff on Japanese premier's office roof. Japanese media said it contained minute traces of radiation Published April 22nd 2015, 12:30 am. advertisement. Related Videos. (1:35) Playing Next Next ...Drone with "minuscule" quantity of radiation lands on Japan PM's office - mediaReutersDrone Found on Roof of Japanese PM's OfficeVoice of AmericaDrone found on roof of Japanese PM's office in TokyoPCWorldReuters Africa -Irish Independent -Times LIVEall 127 news articles »