December 21, 2018 / 8:32 AM / 3 months ago

CORRECTED-UPDATE 8-London's Gatwick airport reopens after mystery drone saboteur sows chaos

(Corrects paragraph 7 to show last time drone seen was Thursday not Friday)

* Gatwick reopens after 36 hours of chaos

* 700 flights to take off on Friday

* Drone operators not yet detained

* Army and police snipers hunt rogue drones

* Pilots union concerned at risk of collision

By Toby Melville

GATWICK, England, Dec 21 (Reuters) - London's Gatwick Airport reopened on Friday after a mystery saboteur wrought 36 hours of travel chaos for more than 100,000 Christmas travellers by using drones to play cat-and-mouse with police snipers and the army.

After the biggest disruption at Gatwick, Britain's second busiest airport, since a volcanic ash cloud in 2010, Gatwick said around 700 planes were due to take off on Friday, although there would still be delays and cancellations.

Britain deployed unidentified military technology to guard the airport against what Transport Secretary Chris Grayling said were thought to be several drones.

"I think passengers are safe," Grayling said. "This kind of incident is unprecedented anywhere in the world."

The motivation of the drone operator, or operators, was unclear. Police said there was nothing to suggest the crippling of one of Europe's busiest airports was a terrorist attack.

Gatwick's drone nightmare is thought to be the most disruptive yet at a major airport and indicates a new vulnerability that will be scrutinised by security forces and airport operators across the world.

The army and police snipers were called in to hunt down the drones, thought to be industrial style craft, which flew near the airport every time it tried to reopen on Thursday. The last time a drone was spotted at the airport was at 2200 GMT on Thursday.

The perpetrator has not yet been detained but the police said they had a number of possible suspects. No group has claimed responsibility publicly and police said there was no evidence another state was involved.

Sussex Police Assistant Chief Constable Steve Barry said they were keeping an open mind about who was responsible.

"In terms of the motivation, there's a whole spectrum of possibilities, from the really high-end criminal behaviour that we've seen, all the way down to potentially, just individuals trying to be malicious, trying to disrupt the airport," he said.

After a boom in drone sales, unmanned aerial vehicles have become a growing menace at airports across the world.

In Britain, the number of near misses between private drones and aircraft more than tripled between 2015 and 2017, with 92 incidents recorded last year.

THERMAL IMAGING?

The British Airline Pilots' Association (BALPA) said it understood "detection and tracking equipment" had been installed around Gatwick's perimeter.

BALPA said that it was extremely concerned at the risk of a drone collision. Flying drones within 1 km (0.6 mile) of a British airport boundary is punishable by five years in prison.

The defence ministry refused to comment on what technology was deployed but drone experts said airports needed to deploy specialist radar reinforced by thermal imaging technology to detect such unmanned flying vehicles.

Other ways to tackle them is typically by frequency jamming that can disable or disrupt control signals and the GPS signals that allow the drones to navigate.

The drone sightings caused misery for travellers, many sleeping on the airport floor as they searched for alternative routes to holidays and Christmas family gatherings.

Flights were halted at 2103 GMT on Wednesday after two drones were spotted near the airfield. The disruption affected at least 120,000 people on Wednesday and Thursday, with thousands more to be disrupted on Friday.

It was not immediately clear what the financial impact would be on the main airlines operating from Gatwick including easyJet , British Airways and Norwegian.

Britain's Civil Aviation Authority said it considered the event to be an "extraordinary circumstance" meaning airlines are not obliged to pay compensation to affected passengers.

Airlines will have to refund customers who no longer wish to travel however and try to reschedule flights to get passengers to their destinations.

A Reuters witness at Gatwick's South Terminal said the airport was busy, with many people waiting with luggage and queues for service desks, but not unusually so for such a day.

Some airport staff handed out chocolate and Christmas elf toys to stranded passengers.

Some, like Sarah Garghan-Watson, chose to stick it out at the airport overnight, having arrived at 8 a.m. on Thursday.

"It's now 2 o'clock in the morning at Gatwick, and it's very bright and very noisy. It's now also very cold," she said in a video shown on Sky.

"All I can see tonight ... is a sign that says 'no more sleeps until the beach'. And here we are, sleeping, in the stairs at Gatwick, because there's no flights."

Editing by Alison Williams

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