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The man arrested after a thwarted attack on a train last Friday was known to intelligence agencies in several countries, including France. Yet Ayoub El-Khazzani, 25, was still able to board a busy Paris-bound train after acquiring an assault rifle and ammunition. Michel Deléan and Louise Fessard ask if European secret services again let a potential terrorist through the net – or whether surveillance on so many potential suspects is simply impossible.
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