Adama Simila wears a knife tied to his belt by a piece of rope, his only protection against the Boko Haram group that has repeatedly targeted his home town in remote northern Cameroon. While the threat once came from heavily armed, battle-hardened fighters crossing from neighbouring Nigeria, today Simila knows he is more likely to die at the hands of a teenage girl strapped with explosives. "We're here to look out for suicide bombers," said the 31-year-old, a member of a local civilian defence force in the town of Kerawa. After watching its influence spread during a six-year campaign that has killed about 20,000 people, Nigeria has now united with its neighbours to stamp out Boko Haram. A regional offensive last year drove the fighters from most of their traditional strongholds, denying them their dream of an Islamic emirate in northeastern Nigeria. A 8,700-strong regional force of troops from Benin, Cameroon, Chad, Niger, and Nigeria is seeking to finish the job. Now,
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