Japanese investigative sources say unidentified objects suspected to be drones have been spotted above several places in Tokyo, including an area near the Imperial Palace.
The sources say the objects were observed flying between about 8 p.m. and 10 p.m. on Thursday local time. They say the objects were moving while flashing red and white lights.
Japanese law prohibits operating drones over crowded urban areas, airports, and important facilities such as the Imperial Palace.
Police are investigating why the objects were being flown.