London’s Heathrow Airport appears to have worked out how to jam drone signals to stop climate-change protesters from disrupting its airspace.

Activists from the group Heathrow Pause attempted to fly drones close to the airport at about 3 a.m. on Friday but found when they tried to launch them that most did not work.

They speculated that airport staff used “signal jamming” to stop the drones from working.

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