HBO used anti-drone guns to prevent UAVs from filming its sets and revealing spoilers, actress Sophie Turner said.
Turner, who plays Sansa Stark on the HBO drama, told EW at New York Comic Con that "if a drone flies above sets, there’s a thing that can kill the drones, which is really cool."
She added that it "creates a field around it and the drones just drop. It’s very X-Men."
The "drone killers" are sometimes used by police departments to bring down drones that interfere with emergency operations.
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Source: Inside Newsletter