Attack of the drones: the mystery of disappearing swarms in the US midwest, Drones (non-military)

When groups of sinister drones began hovering over homes in America’s Midwest, the FBI, US Air Force and 16 police forces set up a task force. But the drones vanished. Did they even exist? Amelia Tait investigates

White House Workshop Predicts Deadly Drone Attacks in US

Vatican: Swarms of 'kamikaze' mini-drones pose threat to civilians

US Navy apparently gearing up to use drone swarms in the future - Interesting Engineering

The Army is using drone swarms against its soldiers in training

Pentagon Puts Out Call for Swarming Attack Drones That Could Blunt a Taiwan Invasion - USNI News

List of unmanned aerial vehicles - Wikipedia

Thinking Big with Small Drones: An Allied Approach to Swarming - War on the Rocks

Drone swarm attack simulated by US army using 'lethal' quadcopters

Mysterious drone attacks on US war ships solved