LONDON (AP) — London’s Heathrow Airport briefly halted departing flights on Tuesday after a reported drone sighting — a development that came just three weeks after multiple reports of drone sightings caused travel chaos at nearby Gatwick Airport.

The suspension of takeoffs from Heathrow, one of the world’s busiest airports, was announced shortly before 6 p.m. on Tuesday, a move the airport said was made as a safety precaution.

London’s Metropolitan Police said it received a report about a drone “in the vicinity of Heathrow airport” at about 5:05 p.m. Police and airport officials were investigating the reported sighting. Flights resumed roughly 90 minutes later.

Police Commander Stuart Cundy said police officers were among those who had seen the drone.

“A full criminal investigation has been launched,” he said. “We are carrying out extensive searches around the Heathrow area to identify any people who may be responsible for the operation of the drone.”

He said “military assistance” has been added since the sighting to toughen the airport’s anti-drone stance and that extra police officers and equipment had been added at Heathrow.

The airport said that “based on standard operating procedures, working with Air Traffic Control and the Met Police, we have resumed departures out of Heathrow following a short suspension.”

The temporary departure shutdown at Heathrow follows the pre-Christmas shutdown of London’s Gatwick Airport for parts of three consecutive days due to dozens of reported drone sightings. The Gatwick closure stranded or delayed more than 100,000 travelers — the worst-ever drone-related disruption at an international airport.

The person or persons responsible for the Gatwick drones have not been located and no group has claimed responsibility.

British officials used sophisticated military gear to get Gatwick back in operation, and aviation authorities said that equipment could be deployed at other British airports to deter drone intrusions.

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