The Defense Department detected nearly 100 unauthorized drones flying near the Pentagon over a two-month period last year, according to officials involved in a survey of drone activity near military bases.
The study — conducted amid concerns that terrorists and spies could use the remotely piloted aircraft for surveillance, espionage and attacks — follows a Federal Aviation Administration ban of unauthorized drone flights over 133 military bases.
Officials did not provide a list of the installations involved in the survey.
