The military is helping police after sightings of a drone temporarily halted flights at Heathrow airport on Tuesday.
Scotland Yard said a “full criminal investigation” had been launched into the incident – and that officers were among those to see the drone.
Departures from the west London airport were suspended for about an hour.
It comes after thousands of passengers were caught up in disruption at Gatwick Airport last month following reports of drone sightings.
Heathrow airport, which is also working with the Met
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