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When the firecrackers exploded inside the drain, the cover was blown off, soaring 10 meters into the air. The boy was standing too close to the drain, and the force of the explosion threw him back, and he fractured the base of his skull. He was taken to hospital and has since been released.

The severity of the accident, experts said, might have been caused by the thick marsh gas inside the sewer. The lighted firecrackers the boy threw down the drain ignited the marsh gas, which then caused the powerful explosion.

(Liaoshen Evening News)