drones-faa1A drone carrying small amounts of radioactive material landed on the office roof of Japan Prime Minister Shinzo Abe, raising questions about the dangerous potential of the aerial devices.

The Wall Street Journal reported that police found “trace levels” of radioactive cesium near the four-propeller drone. Abe was traveling in Indonesia when the UAV landed on his office in Tokyo.

The drone had a camera, smoke flares, and a plastic bottle with cesium, which could have come from the Fukushima power plant that suffered a disastrous meltdown in 2011, the Japan Times reported.

A government official in Abe’s cabinet told CNN that “there might be terrorism attempts in the future at the Olympics and G7 Summit using drones.”

Japan is hosting the Summer Olympics in 2020 and G7 next year. The country, which was devastated by the 2011 nuclear disaster, was already analyzing the strength of its drone laws before Wednesday.

A similar situation happened when a man crashed his recreational drone on White House grounds in January.

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