Investigators gather around a small drone covered with blue sheets, on the roof of Prime Minister Shizo Abe's official residence in Tokyo Wednesday, April 22, 2015. Japanese authorities were investigating Wednesday after the small drone reportedly containing traces of radiation was found on the roof of the prime minister's office, sparking concerns about drones and their possible use for terrorist attacks.
Investigators gather around a small drone covered with blue sheets, on the roof of Prime Minister Shizo Abe's official residence in Tokyo Wednesday, April 22, 2015. Japanese authorities were investigating Wednesday after the small drone reportedly containing traces of radiation was found on the roof of the prime minister's office, sparking concerns about drones and their possible use for terrorist attacks. Tsuyoshi Ueda Kyodo News/AP
Investigators gather around a small drone covered with blue sheets, on the roof of Prime Minister Shizo Abe's official residence in Tokyo Wednesday, April 22, 2015. Japanese authorities were investigating Wednesday after the small drone reportedly containing traces of radiation was found on the roof of the prime minister's office, sparking concerns about drones and their possible use for terrorist attacks. Tsuyoshi Ueda Kyodo News/AP

Drone found on roof of Japanese prime minister’s office

April 22, 2015 07:47 AM