A new study conducted by startup company Dedrone, in tandem with the Department of Defense, revealed the alarming find that unauthorized drones are flying twice a day on average above a U.S. military base just four miles from the White House.

“This is a concerning rate,” Dedrone CEO Jorg Lamprecht told CNBC, “especially in light of international incidents where drones have crashed into other aircraft, and been used by terrorists, and used in other illicit activities.”

To conduct their study, Dedrone and personnel from Joint Base Myer-Henderson Hall installed drone detection systems on the roof of the National Defense University at Fort McNair. The systems picked up on 52 unwanted drone flights over 26 days during the late summer and early fall.

Offending pilots used several different drone models from DJI, the industry leader in drone hardware, and a 3DR Solo drone.

At Fort Myer, another base in D.C., Dedrone’s systems detected 43 unauthorized flights over 30 days in September, perpetrated by pilots of DJI and Parrot drones.

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