London's Heathrow Airport says flight departures have been suspended as a precaution after a reported drone sighting.
The suspension of takeoffs from Britain's busiest airport was announced shortly before 6 p.m. on Tuesday.
Airport officials say they are working closely with police to clarify the situation.
The report follows the pre-Christmas shutdown of London's Gatwick Airport for parts of three consecutive days due to reported drone sightings.
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The Gatwick closure led to more than 100,000 people being stranded or delayed, the worst ever drone-related disruption at an international airport.