Gunmen in the northern Nigerian state of Yobe have shot dead at least six Christians, the army and local officials say. They say a church in Peri village near Potiskum, the economic capital of Yobe, was set on fire in an attack late on Christmas Eve.
No group has so far said it carried out the attack. The Boko Haram Islamist militant group has targeted a number of churches in the north since 2010. It has killed hundreds in its campaign to impose Sharia law.