Gunmen have killed 36 gold miners in north-east Nigeria, police say.

The attackers overran a mining camp in the Maru district of Zamfara state, in the latest in a series of similar raids in the region.

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The gunmen’s motive is unclear. Zamfara governor Abdulaziz Yari Abubakar called the attack an “act of terrorism”.

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In July Nigerian President Muhammadu Buhari sent special military units to fight armed gangs in based in the forests of Zamfara.

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Hundreds of people have been killed in villages in the area over the past three years.