https:// www.defenseone.com/technology/2018/05/criminal-gang-used-drone-swarm-obstruct-fbi-raid/147956/

Mazel said the suspects had backpacked the drones to the area in anticipation of the FBI’s arrival. Not only did they buzz the hostage rescue team, they also kept a continuous eye on the agents, feeding video to the group’s other members via YouTube. “They had people fly their own drones up and put the footage to YouTube so that the guys who had cellular access could go to the YouTube site and pull down the video,” he said.