Investigators gather around a small drone covered with blue sheets, foreground, of the roof of Prime Minister Shizo Abe's official residence in Tokyo Wednesday, April 22, 2015. Japanese authorities are investigating the small drone that had landed on the roof. No injuries or damage have been reported from Wednesday's incident, and Abe is away, on a visit to Indonesia to attend the Asia-African Conference. Police said it was not immediately known who was responsible. They are investigating a possibility it had fallen during a flight. (Tsuyoshi Ueda/Kyodo News via AP) JAPAN OUT, MANDATORY CREDIT
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Drone found on roof of Japanese Prime Minister's office
Police say a drone carrying traces of radioactive material was found on the roof of Japanese Prime Minister Shinzo Abe's office. Abe was not there at the time.
01:00 - Source: CNN
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Investigators gather around a small drone covered with blue sheets, foreground, of the roof of Prime Minister Shizo Abe's official residence in Tokyo Wednesday, April 22, 2015. Japanese authorities are investigating the small drone that had landed on the roof. No injuries or damage have been reported from Wednesday's incident, and Abe is away, on a visit to Indonesia to attend the Asia-African Conference. Police said it was not immediately known who was responsible. They are investigating a possibility it had fallen during a flight. (Tsuyoshi Ueda/Kyodo News via AP) JAPAN OUT, MANDATORY CREDIT
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