A plane approaching Heathrow Airport is believed to have hit a drone before it landed safely, the Metropolitan Police has said.
The British Airways flight from Geneva was hit as it approached the London airport at about 12:50 BST with 132 passengers and five crew on board.
After landing, the pilot reported an object – believed to be a drone – had struck the front of the Airbus A320.
Aviation police based at Heathrow have launched an investigation.
Police said no arrests have been made.
If confirmed, it is believed to be the first incident of its kind in the UK.
Flying a drone near an airport can already be punished with up to five years in prison, and rules also forbid taking them above 400ft (122m) or near buildings and crowds of people.
But the latest incident will only add to the pressure for further steps to be taken.