At least five persons were killed and around a dozen others injured Sunday when a spark from a gas welding machine triggered explosion in a shop where firecrackers were kept in Mukeriganj area of the district, officials said.
Police said the explosion took place in the shop located in the Kotwali police station area at around 5.00 pm.
The shop, which had kept the firecrackers, did not have the licence required for this, District magistrate of Azamgarh Shivakant Dwivedi said.
He said the district administration is probing whether the firecrackers kept in the shop were kept by its owner or by the licensee of the firecrackers.
Fire-tenders rushed to the spot as soon as they were informed.
Police and district administration officials have also reached the spot to facilitate rescue operations.
Officials said the deceased are yet to be identified and the death toll might rise.