Flights were suspended for 30 hours after the multiple drone sightings at Gatwick Airport in December.
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Gatwick drone shutdown
Defence firm Raytheon has developed a mobile system to protect the military and airports from drones.
Extinction Rebellion is planning a demonstration against a Heathrow extension on Tuesday.
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Three flights are diverted to Stansted Airport after a possible drone sighting at Gatwick.
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Justin Rowlatt
BBC News
The drone operator was monitoring activities at the airport during the attack, officials believe.
Read moreMOD launches £2m competition to counter drones threat
Lizzie Massey
BBC Live reporter
The Ministry of Defence has launched a competition to find "innovative solutions" to address the increasing drone threat to the defence and security of the UK.
The total funding for the competition is expected to be at least £2m.
The Defence and Security Accelerator (DASA), the MOD’s innovation hub, is seeking "robust and cost-effective next-generation solutions" to the risks posed by hostile Unmanned Aerial Systems (UAS).
As the security threats from hostile drones are evolving at pace, it’s critical that our armed forces benefit from the very latest technology to stay ahead. This competition will draw on the brightest and best of our defence industry."
Drone sightings that closed Gatwick last year led to policing costs of £459,000, figures show.
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Harriet Agerholm
BBC News
Extended drone no-fly zones have come into force around airports, but the technology isn't all bad.
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Niall McCracken
BBC News NI
PSNI drones were used in wildlife rescues, missing person hunts and VIP visits, figures reveal.
Read moreThe Department for Transport confirms the new legislation regarding drone no-fly zones extends to NI.