At least six persons were suffocated in the fire in the blasts late last night. One another was hospitalised and is now in stable condition, according to local authorities, state-run Xinhua news agency reported.
The incident took place in a commercial and residential building at 9:08 PM yesterday.
It was triggered by firecrackers lit by a buyer outside the store after purchase.
China permits fireworks to be used in month long Chinese New Year celebrations, starting from January 27.