On Wednesday, the Department of the Interior (DOI) grounded nearly its entire fleet of drones fearing the unmanned aerial vehicles (UAVs), which are mostly made in China, might pose a threat to U.S. national security.

The DOI, which is responsible for maintaining federal land, uses a fleet of 810 drones to help in tasks such as monitoring floods and fires, inspecting dams and property, and tracking endangered species. At least 15% of the drones used by the DOI are manufactured entirely by Shenzhen-based DJI, the world’s largest supplier of drones, while the remainder are all made in China or contain China-made parts.

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