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London Heathrow Airport. Photo: Niklas Halle'n, WPA Pool/Getty Images
London's Heathrow Airport announced that it had suspended departures Tuesday as authorities investigated a reported drone sighting.
Why it matters: Heathrow is the busiest airport in Europe and the second-busiest airport in the world by international passenger traffic. Drone disruptions shut down London's Gatwick Airport during holiday travel last month, though authorities never determined who was responsible.
Go deeper: Gatwick drone debacle foreshadows nightmare security threat