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Egypt Air planes sit on the tarmac at Cairo international aipport on March 22, 2017. Hours after the US government warned that extremists plan to target passenger jets with bombs hidden in electronic devices, and banned carrying them in cabins on flights from 10 airports in eight countries in the Middle East and North Africa, Britain tightened airline security on flights from the same region, banning laptops and tablet computers from the plane cabin. / AFP / KHALED DESOUKI