An explosion had earlier occurred a few hours after a special prayer session organised by the state government in the morning.
Capt. Ikedichi Iweha, the Military Joint Task Force spokesman, who confirmed the incident, told newsmen that security personnel had secured the area to minimise civilian casualties.
He urged people to go about their lawful businesses, saying that no death was recorded in the explosion.
NAN reports that men of the Bomb Disposal Unit of the Nigeria Police were at the scene.