A safety report from the Civil Aviation Authority today reveals a drone was flown within a few yards of a passenger plane landing at Heathrow Airport. It brings to six the number of recent incidents.
The pilot of the Airbus A319 said the drone may have been just 20 feet above and 25 yards to the left when it passed by the aircraft in the incident last September.
He told the UK Airprox Board - which investigates incidents - that it was not possible to take avoiding action and the incident was put in the most serious risk category.
The plane was flying at an altitude of 500 feet and was on the final approach to the airport on September 30 when the drone was spotted.
Officials said that the drone was flown against Civil Aviation Authority regulations because it did not have permission to be above 400 feet within the Heathrow control zone.
The space between the drone and the jet had been reduced to about a wingspan - described as "the bare minimum" - and that "chance had played a major part" in the avoidance of a collision.
A police investigation was launched but the drone operator has not been found.
More top news
At its height, around 45 firefighters tackled the flames - which spanned the size of 50 football pitches.
Coprorals Matthew Hatfield and Darren Neilson died of their injuries after an incident at an Army live-firing range
Detectives are investigating the murder of Dawn Sturgess, 44, and the poisoning of her partner, Charlie Rowley, 45.