The U.K.'s Ministry of Defence said British soldiers had used an "invisible radio-wave weapon" to knock out swarms of drones for the first time. A type of directed energy weapon, high frequency radio waves wreak havoc on the critical parts of a drone, making the UAVs malfunction or career off course and crash, London said.

The U.K. military has carried out a first successful test of a British-made "directed energy weapon" to down dozens of drones at once.