Tokyo (CNN)A drone carrying small traces of a radioactive material was found Wednesday morning on the roof of Japanese Prime Minister Shinzo Abe’s office, police said.
A member of the Prime Minister’s staff spotted the four-propeller, 50-centimeter wide drone and alerted authorities, Tokyo Metropolitan Police said.
The drone was equipped with a small camera and a plastic bottle containing small traces of a radioactive material, police said.
The material was cesium, a soft metal, and what was found was harmless to the human body, police said.
Two smoke flares were attached to the drone, police said.
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