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A "near miss" between a passenger jet and a drone has prompted warnings about safe use of the hobby aircraft.
An Airbus A320's wing passed 6m (20ft) below a drone hovering at Heathrow, said the Civil Aviation Authority.
It said drone pilots would face prosecution if they put the safety of other aircraft at risk.
News about the mid-air encounter comes only days after a Lufthansa jet nearly collided with a drone on the approach to Warsaw's international airport.
The CAA said it had recorded six other incidents between May 2014 and March 2015 at airports around the UK in which drones and piloted craft almost collided.
The "dronecode" says recreational drone owners should always keep their craft within their line of sight, about 500m (1,640ft), and must not fly higher than 122m. In some of the near-collisions, drones were flying at heights of about 2,000ft, it said.
The code also says that drones carrying cameras must stay at least 50m away from people, vehicles and structures and must not approach a large group of people closer than 150m.
It urged owners to exercise common sense when flying their craft and to avoid the congested airspace around airports.
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