A commercial aircraft on the approach to Heathrow Airport had a "very near-miss" with a drone in the skies above the Shard.
A report by the UK Airprox Board (UKAB), an air safety body, into the incident found that the drone was seen out of the right flight deck window around 12.45pm on July 18.
According to the report, the A320 aircraft, flying at an altitude of 4,900ft near the Shard in central London, "narrowly avoided" a collison with the drone. The plane had around 250 people on board.
The crew said the drone had "probably" passed above the right wing and the horizontal stabiliser, found on the tail of the plane.
The UKAB report said: "Members agreed that this incident appeared to be a very near-miss and that the drone operator should not have been flying in that location at that altitude.
"It portrayed a situation where a collision had only been narrowly avoided and chance had played a major part".
The incident was ruled to be in the most serious category of risk, and they have said that the drone operator has not been traced.