"One of the dead victims from the Kaduna explosion is a three-year-old child whose parent has taken the body for burial," said Yushau Shuaib for the national emergency management agency.
Another official from the agency specified that a total of eight people had so far been confirmed killed.
Police said Wednesday that the explosion seemed to be accidental, but there was speculation that it was a bomb due to its strength and the fact that it took place in an area mainly populated by Christian Igbos.
Police spokesperson Aminu Lawan had earlier in the day said information indicated that the blast was accidental.
"Initially, we thought it was a bomb blast but our preliminary assessment has shown that it was an accidental explosion from a repair shop dealing in car batteries and gas cylinders," Lawan had said.