article_snippet.sent: A drone carrying traces of a radioactive material was found on the rooftop of Japan's equivalent to the White House on Wednesday, police and government officials said.
article_snippet.sent: A staff member spotted the drone Wednesday morning on the roof of Prime Minister Shinzo Abe's residence, Tokyo Metropolitan Police said.
article_snippet.sent: Dozens of police investigators were dispatched to the roof of Abe's residence to investigate the origin of the drone, which had four propeller and was 50 centimeters (20 inches) wide.
article_snippet.sent: Police say the drone was equipped with a small camera, smoke flares and a plastic bottle containing small traces of a radioactive material believed to be cesium, a common byproduct of nuclear reactors.
article_snippet.sent: Japanese law restricts drone flights around airports to prevent problems with aircraft, but there are no flight restrictions for most of Tokyo, including the Prime Minister's residence and local and federal government buildings.
highlights_snippet.sent: The drone was equipped with a bottle containing radioactive material .
  