Amid speculations surrounding the early morning explosion in Sabon Gari, Kano State, parents have stormed schools in the area to withdraw their children.
The incident was said to have affected a private school, a church and a few shops while scores were injured.
The Kano State Police Command had said four persons were killed.
There are videos of pupils running around the streets in blood-stained uniforms circulating on social media.
SaharaReporters had earlier today reported that an early morning explosion at Aba Road, Sabon Gari, threw the residents into confusion.
The incident was said to have occurred at a private school identified as Fimbal Royal Schools.
Gory images and videos of victims have also flooded the microblogging platform, Twitter.
The National Emergency Management Agency has yet to make an official statement.