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2.SentryXBritain must prepare to face the threat of Islamic State terrorists using drones to attack buildings and other landmark targets, a security expert will warn in a book published next month. Nicholas Grossman said that IS had already used drones packed with explosives in Syria and that no terror group had done more to exploit the new technology. He said options for protecting against the danger included using electrical repulsion systems. But he warned that if the use of drones for commercial deliveries and other purposes becomes more common it will become increasingly difficult to stop terrorists using drones to destructive effect. There are already concerns about the potential risk that such devices could pose to aircraft if they stray into flight paths, and the possibility that out-of-control drones could injure people. But in his book Drones and Terrorism, Mr Grossman, an academic from the University of Illinois, warns that the "age of the drone terrorist" has arrived, with IS and other extremist groups already using them for attacks in conflicts overseas. He says the technology is likely to be exploited further to mount attacks in Western cities. "As drones become more commonplace in cities, they will become less conspicuous, making it easier for a terrorist to case or attack a target," he writes. "Electronically repelling drones from restricted airspace, or forcing them to land, would protect landmarks, airports, government buildings or other potential targets … [but] of course someone will find a way around any anti-drone technology."Perhaps the biggest danger is to airports. If a terrorist could fly a drone into a jet engine d |