Four persons have been feared dead in an explosion at a storey building opposite Winners Kid Academy on Aba Road, Sabon Gari area of Kano State.
Several people suffered horrific injuries during the incident.
Death toll may increase, according to eyewitnesses.
The storey building collapsed almost at the same time the heavy sound of explosion was heard, it was learnt.
A team of rescuers are searching through the rubble to rescue people trapped.
It is unclear whether it is a case of a bomb blast or gas explosion.
Police anti-bomb squad and other security units have moved to scene of the incident.