Drone sightings brought chaos for thousands of passengers at Heathrow airport with flights grounded for an hour as police investigated.
Travellers were left waiting on the runway unable to take off from the airport, which is the UK's largest, serving more than 200,000 people every day.
Flights have started to take off again just after 6pm, but it is unclear how many flights will be delayed in the coming hours after flights were halted just after 5pm UK time.
Some passengers stuck inside planes described vehicles out on the runway searching for the drone, while others were told they can ask to disembark.