A drone carrying a small amount of radioactive cesium was found on the roof of Japanese Prime Minister Shinzo Abe’s office on April 22. When exactly the drone landed was unclear. The last time the helipad on the roof had been used was on March 22, when Abe flew to Kanagawa Prefecture for the National Defense Academy’s graduation. However, because the drone was dry when discovered, and it had rained in Tokyo on April 20, authorities believed it had landed on April 21 or 22.
Fukushima No. 1 nuclear plant –which experienced three reactor-core meltdowns after the March 2011 tsunami and earthquake — may be the source of the radioactive material found on the drone.
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