A car bomb has exploded in northern Nigeria, and initial reports say there could be many casualties.
Tuesday's blast took place in a busy area of Maiduguri, the capital of Borno state.
A witness told Reuters news the blast left at least seven people dead.
There were no immediate initial claims of responsibility.
Maiduguri is the home base of Boko Haram, a shadowy Islamist militant group blamed for thousands of deaths over the past five years.
In December, the militant group claimed responsibility for an attack on a military base in Maiduguri.
The defense ministry said more than two dozen insurgents were killed in a shootout between soldiers and militants at the base.