http://www.aljazeera.com/news/2015/0...185726666.html

Authorities in Japan have launched an investigation after a small drone laced with radiation was found on the roof of the prime minister's office.
No injuries or damage were reported in the incident, and police said on Wednesday that they were investigating the possibility it had crashed during a flight.
Prime Minister Shinzo Abe is currently in Indonesia attending an Asian-African conference.
Video from public television broadcaster NHK earlier showed dozens of police officers and officials around the drone, which was covered by a blue tarpaulin.
The drone, which was about 50 centimetres in diameter, had four propellers and was carrying a small camera and a plastic bottle with unidentified content inside, Tokyo's Metropolitan Police Department said.
It said the bottle was believed to be the source of radioactive cesium contamination.
The drone was also decorated with a symbol that warns of radioactive material, according to NHK.