Image copyright PA Image caption Police said the suspected drone had struck an inbound Airbus A320, similar to this one 
 
 A police investigation is under way after a passenger plane approaching Heathrow Airport flew into what is believed to have been a drone. 
 
 The British Airways flight from Geneva, with 132 passengers and five crew on board, was hit as it approached the London airport at 12:50 BST on Sunday. 
 
 If confirmed, it is thought it would be the first such incident in the UK. 
 
 BA said it would give the police "every assistance with their investigation". No arrests have been made, police say. 
 
 The Metropolitan Police said the plane was hit by the drone at about 1,700ft (580m) while flying over the area of Richmond Park, in south west London. 
 
 No debris has been found and police have asked for anyone who finds drone parts in the Richmond area to come forward. 
 
 The force's aviation security unit, based at Heathrow, is leading the investigation. 
 
 'Very real danger' 
 
 After safely landing the plane, the pilot reported an object had struck the front of the Airbus A320. 
 
 A BA spokesman said: "Our aircraft landed safely, was fully examined by our engineers and it was cleared to operate its next flight." 
 
 Chief Superintendent Martin Hendy, head of the Met's aviation policing command, said the incident highlighted "the very real dangers of reckless, negligent and some times malicious use of drones". 
 
 A Civil Aviation Authority (CAA) spokesman said it was "totally unacceptable" to fly drones - which are generally used to capture aerial film or photographs - close to airports. 
 
 Steve Landells, from the British Airline Pilots Association (Balpa), said it had been "only a matter of time before we had a drone strike". He called for greater enforcement of existing rules. 
 
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 The rules for flying domestic drones 
 
 Analysis 
 
 Image copyright PA 
 
 Leo Kelion, Technology editor 
 
 Flying a drone near an airport can already be punished with up to five years in prison, and rules also forbid flying them "beyond the direct unaided line of sight" of the operator or near buildings and crowds of people. Drones may not fly above 400ft (122m). 
 
 But the latest incident will only add to the pressure for further steps to be taken. 
 
 The US recently introduced a compulsory registration scheme so any drone recovered from an accident can be traced back to its owner. 
 
 In addition, officials could make it mandatory for drones to run geo-fencing software - that would prevent them flying in restricted areas. 
 
 The Department for Transport has promised to publish a strategy for unmanned aircraft this year. 
 
 Pilots have also called for it to fund tests into what would happen if a drone got sucked into an engine or crashed into a plane's windscreen. 
 
 Last month, the British Airline Pilots Association noted that while the threat of bird strikes had been well researched, there was little data about how much damage a drone could cause a plane. 
 
 The incident follows a warning earlier this year by the head of the International Air Transport Association Tony Tyler that drones flown by the general public are "a real and growing threat" to civilian aircraft. 
 
 The UK Air Proximity Board - which investigates near-miss incidents in UK airspace - said there had been a number of serious near-misses at UK airports involving drones. 
 
 David Black, from Blackwing Aerial Services - a company that specialises in licensed commercial drones - said education and enforcement of the current rules were important, particularly for hobbyists. 
 
 "I think a register is a good idea," he said. 
 
 "With firearms it has shown it's a good thing... but it has not stopped bad guys from getting guns. If you're going to use them as weapons, bad guys can build them themselves. 
 
 "You need enforcement, but the problem with enforcement is that it costs money and people to carry it out.... There needs to be better technology for detection and avoidance." 
 
 Geo-fencing is available in some drones - a database within the drone will not let it take off if it is near an airport so that operators cannot accidentally fly into trouble. 
 
 Mr Landells from Balpa added: "The law as it stands says you're not supposed to go above 400ft (122m) or 500m away from the base unit, depending on the drone you're using, but we've been seeing incidents up at 8,000 feet, where drones just have no place to be, so we've got to do something. 
 
 "That's a registration process, some sort of tracking, some sort of electronic security - we've got to do something about this." 
 
 Drone incidents at UK airports 
 
 Image copyright BAA 
 
 17 April 2016 - A British Airways plane approaching Heathrow is believed to have hit a drone while in midair 
 
 28 November 2015 - The pilot of an A321 plane narrowly missed a drone hovering at 100ft above a runway at Gatwick Airport 
 
 30 September 2015 - A small drone helicopter passed within 30ft of the cockpit of an A319 plane while on the approach to Heathrow 
 
 22 September 2015 - A "quadcopter-type drone" missed the right-hand side of a B777 plane by about 25m while at 2,000ft after it left Heathrow Airport 
 
 13 September 2015 - A silver drone with a "balloon-like" centre missed an E170 aircraft by about 20m, while the plane was approaching London City Airport over the Thames 
 
 13 September 2015 - A drone flew over the top of a B737 aircraft while at 4,000ft, missing it by about 5m, shortly after it left Stansted 
 
 27 August 2015 - A DO328 aircraft flew within 50ft of a drone while approaching Manchester Airport at 2,800ft 
 
 Source: The UK Airprox Board ||||| Story highlights London police seek public's help in finding operator of drone that may have struck airliner 
 
 No one was hurt and the plane wasn't damaged, but authorities worry about potential for catastrophe 
 
 London (CNN) Did a drone hit an airliner trying to land at London's Heathrow Airport? 
 
 The pilot of a British Airways flight certainly thinks so, and now authorities would like to find out who might have been behind the weekend incident. 
 
 British Airways Flight BA727 from Geneva was approaching Heathrow on Sunday afternoon when what the pilot believed to be a drone struck the front of the aircraft, London Metropolitan Police said. The plane was 1,700 feet in the air at the time, police said. 
 
 The Airbus A320 landed safely, with none of the 132 passengers and five crew members on board injured, British Airways spokesman Michael Johnson said. 
 
 The plane was fine, too, he said. ||||| Story highlights At least 327 incidents fall under the definition of close encounters 
 
 "Incidents largely occur ... where manned air traffic density is high," expert says 
 
 (CNN) Hundreds of drones fly dangerously close to manned aircraft in U.S. airspace, forcing pilots to take evasive action sometimes, a new study shows. 
 
 Experts reviewed 921 cases involving drones and manned aircraft between December 2013 and September this year. 
 
 Of those, 327 incidents fall under the definition of close encounters, according to Bard College's Center for the Study of the Drone. 
 
 It defined "close encounters" as drones coming within 500 feet of aircraft. 
 
 In close encounters, pilots "maneuvered to avoid a collision with a drone" at least 28 times, the study says. Such encounters involved various aircraft, including passenger jets and helicopters. 
 
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 A British Airways pilot flying into London reported that a drone had struck his plane Sunday afternoon, according to police. 
 
 An object, believed to be a drone, struck the front of a plane landing at Heathrow Airport from Geneva, Switzerland, about noon (7 a.m. ET), according to London's Metropolitan Police. The flight landed safely, police said. 
 
 No arrests had been made, but the Met's Aviation Police warned that flying a drone too close to a plane is illegal. 
 
 Officers are currently speaking to a pilot who has reported a drone flying very close to his aircraft on approach to Heathrow. 1/2 CAD1 — Aviation Policing (@MPSHeathrow) April 17, 2016 
 
 2/2 This is dangerous, it is also a crime. Please be aware of the rules before you start flying a drone. https://t.co/jMiDJkJb6Y — Aviation Policing (@MPSHeathrow) April 17, 2016 
 
 Five crew members and 132 passengers were aboard the Airbus A320 at the time, British Airways spokesman Michael Johnson told NBC News. 
 
 British Airways said in a statement that the plane was inspected and cleared for the next flight. 
 
 "Safety and security are always our first priority and we will give the police every assistance with their investigation," the statement said. ||||| Play Facebook 
 
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 LONDON — Aviation officials admitted Monday they have little idea about what would happen were a drone to get sucked into an airliner's jet engine during a flight. 
 
 The revelation came after a British Airways airline pilot reported a drone struck his plane as he was descending into London's Heathrow Airport on Sunday. 
 
 The Airbus A320 aircraft was examined and cleared for its next flight and a spokesman for London's Metropolitan Police said Monday that no arrests had been made. 
 
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 The incident is part of a snowballing trend. 
 
 There were 40 near-misses between drones and manned aircraft in the U.K. last year — up from just nine in 2014. In the U.S., the Federal Aviation Authority said pilots reported more than 650 drone sightings in the first eight months of last year, up from 238 during 2014. 
 
 Related: Dutch Police Train Eagles to Bring Down Rogue Drones 
 
 However, there have been no live tests to explore just how bad a direct hit from a drone on a jet engine would be, a spokesman for the British government's Civil Aviation Authority told NBC News on Monday. 
 
 "You have got something that's made of hard materials, and obviously there's a lithium battery in there too," the spokesman said. "Whereas a bird is a very different proposition, it's much softer. So there's probably a degree of a lack of knowledge about what the cause and effect would be." 
 
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 Bird strikes have the potential to cripple jet engines — the most famous example being the "Miracle on the Hudson" in 2009. 
 
 In August, NBC News reported that none of the world's biggest engine manufacturers had conducted drone-strike tests because they were not mandated by the FAA. 
 
 Although no live tests have been conducted, a computer model built by the Virginia Tech College of Engineering in December showed at least a hint of the potential dangers. 
 
 "The drone destroys a chunk of the engine's blades," the college said of its findings. 
 
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 Kevin Kochersberger, a mechanical engineering professor at Virginia Tech, said that the research had been "late in coming," given the already booming drone industry. 
 
 "It's probably something we should have looked at a few years ago," he said in a statement accompanying the research. 
 
 Unlike the U.S., British drone enthusiasts do not need to register their drones, although the U.K.'s CAA said on Monday that the government would be "carrying out a consultation of future drone regulation in the near future."
– In what the UK's Civil Aviation Authority says would be "a totally unacceptable" first, a British Airways plane landing at Heathrow appears to have been hit by a drone on Sunday, the BBC reports. The Airbus A320 coming into London from Geneva had 132 passengers and five crew members aboard, a BA spokesman tells CNN; the incident was reported after the BA pilot touched down. "Our aircraft landed safely, was fully examined by our engineers and it was cleared to operate its next flight," the rep says. No arrests have been made (it's unclear whose drone it may have been), and the aviation security arm of the Metropolitan Police is looking into the matter. Police note that flying a drone too close to a plane is illegal, NBC News reports, with punishment including up to five years in prison. Specifically, drones over 15 pounds can't fly higher than 400 feet and aren't permitted to fly "beyond the direct unaided line of sight" of its operator or near crowds or buildings. Not that the incident came as a total surprise: The head of the International Air Transport Association had previously noted the "real and growing threat" of a drone-plane hit, while a British Airline Pilots Association rep says it was "only a matter of time." A recent study by Bard College's Center for the Study of the Drone underscores the danger in US airspace, with 327 "close encounters" of drones flying within 500 feet of manned aircraft between December 2013 and September 2015, and at least 28 pilots "[maneuvering] to avoid a collision with a drone." Frighteningly, aviation experts say they don't really know what would happen if a drone got sucked into a plane's engine, a Civil Aviation Authority rep tells NBC. (A drone recently came within 200 feet of a plane at LAX.)