A blast has rocked an area near a mosque in the restive north-eastern Nigerian city of Maiduguri, with witnesses reporting four deaths.
In a BBC interview, Nigerian army spokesman Brig Gen Isa blamed the Islamist group Boko Haram.
The group - which wants strict sharia law - has carried out scores of attacks, mainly in the north-east.
It has said it attacked several churches on Christmas Day, killing at least 42 people.
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