Reports indicated that than 30 people are feared died and several others sustaining injuries after an explosion in the Nigerian city of Yola.
The blast appears to have struck a busy market area where traders were closing up for the day.
Nigerian President Muhammadu Buhari visited Yola on Saturday, declaring that the Islamist militant movement Boko Haram was close to defeat.
Yola has twice been hit by deadly bomb attacks this year. The city lies in the northern state of Adamawa, one of the worst hit by the Boko Haram insurgency.
Founded in 2002, initially focused on opposing Western-style education - Boko Haram means "Western education is forbidden" in the Hausa language
The group launched its military operations in 2009 and has since killed thousands, mostly in north-eastern Nigeria and abducted many including at least 200 school girls.