A police helicopter flies over Gatwick Airport. Image Credit: AP

London: A man and a woman arrested over the drone disruption that brought Christmas getaway flights to a standstill at London Gatwick Airport were released without charge on Sunday, police said.

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"Both people have fully co-operated with our enquiries and I am satisfied that they are no longer suspects in the drone incidents at Gatwick," Sussex Police detective chief superintendent Jason Tingley said in a statement.

Flights to and from Gatwick were operating normally Sunday, airport authorities said, after days of disruptions began Wednesday night when drones were seen over the airfield.

Authorities fear that a drone could damage a plane in flight or be sucked into a plane's engine, causing a deadly crash.

Police had searched a house in Crawley for clues after the arrests but Sussex Chief Detective Jason Tingley said he's satisfied the two are no longer suspects.

"We ask for the public's continued support by reporting anything suspicious, contacting us with any information in relation to the drone incidents at Gatwick," he said.

Police say Gatwick Airport has offered a 50,000 pound ($63,000; Dh231,399) reward through Crimestoppers for information leading to the arrest and conviction of the fugitive drone operators.

British military personnel and their equipment are being deployed at Gatwick, which handles 43 million passengers a year, to buttress police in an effort to deter drone use and try to keep the airport operating if another drone is spotted.

Officials have not disclosed the technology being used to keep the airfield free of drones.

Police say the motive of the drone operators is not yet known but they do not believe it is "terror-related".