Gunmen have killed 13 people in an attack on a school in Zamfara State.
People in Damaga said dozens of armed men arrived on motorbikes and opened fire. They also stole cattle.
Last month, nearly 300 girls were taken from a school in Zamfara state. They were later released.
In a separate attack last month, girls at a school in Zamfara were snatched from their dormitories in the middle of the night
Kidnappings and killings are increasing in north-western Nigeria.
The authorities in Kaduna state have released a report saying nearly 2,000 people in the state were killed or abducted by criminal gangs last year.
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