A car bomb has exploded in the north-eastern Nigerian city of Maiduguri, and there are fears of many casualties.
Reports say a second car was set on fire by the blast. Blood-spattered people were seen fleeing and vehicles crashed into each other as they tried to leave, while soldiers fired automatic weapons.
A suicide bomber is suspected of being behind the blast.
The Islamist militant group, Boko Haram, is active in the region.