Some American schools are now turning to a hi-tech drones to combat active shooters.
Federal officials are warning residents and visitors to keep drones grounded this summer as Philadelphia prepares to host FIFA World Cup matches and weeks of large-scale festivities.
With the push of a button, officers can deploy a drone from outside the department and send it flying at 45 mph to a scene, often arriving within minutes.
Federal aviation officials are investigating a United Airlines pilot's report that his aircraft reportedly struck a drone.
15 agricultural drones that were stolen last month in New Jersey were recovered on Monday elsewhere in the state, the New Jersey State Police said.
Philadelphia Police Commissioner Kevin Bethel says drones represent a growing domestic terrorism threat, prompting new countermeasures as the city prepares for major summer events.