MAIDUGURI, Nigeria (Reuters) - Nigeria lifted a mobile phone blackout on the Islamist militant stronghold of Maiduguri on Friday, saying there were signs of improving security after months of blasts and attacks. Signals were cut in the remote northeastern town and surrounding states in May in a bid to disrupt the activities of the Islamist Boko Haram sect, whose insurgency has killed thousands of people in the past three years. ...

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