At least five people have been killed in an explosion at a market in Maiduguri, north-eastern Nigeria, a witness has told the (BBC).
The explosives were reportedly hidden in a vehicle carrying charcoal.
No group has said it carried out the attack but Maiduguri is the epicentre of the violent campaign waged by militant group Boko Haram.
Earlier, the Nigerian army said it had broken up a Boko Haram cell linked to the abduction of 200 schoolgirls.