Gunmen kill at least 12 people in Nigeria's northern Adamawa state.

Gunmen have killed at least 12 people in Nigeria's northern Adamawa state. This is the latest in a number of attacks that reflect religious tension between Muslims and Christians in this area. The armed Islamist group Boko Haram was suspected to be responsible for the killings.

Travellers in northern Nigeria should exercise extreme caution and avoid public gathering places that might be terrorist targets.

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