Boko Haram has stepped up attacks in recent weeks
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Boko Haram
Behind Baga massacre
Is army failing?
Why is Boko Haram so strong?
Who are Boko Haram?
Boko Haram Islamist militants have attacked the north-east Nigerian city of Gombe, residents say.
Fighters overran a checkpoint on the edge of the city and explosions and gunfire...
