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Lawmakers who were briefed on hundreds of intrusions over the White House, Capitol and Pentagon worry about possible espionage.

Hundreds of Chinese-manufactured drones have been detected in restricted airspace over Washington, D.C., in recent months, a trend that national security agencies fear could become a new means for foreign espionage.

The recreational drones made by Chinese company DJI, which are designed with “geofencing” restrictions to keep them out of sensitive locations, are being manipulated by users with simple workarounds to fly over no-go zones around the nation’s capital.

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