The incident occurred last evening when the victim M Keerthivasan and his friend M Yogesh (7) of Mullai nagar, were playing at the Kudamuruti river bed, they said.
The duo stumbled upon a fire cracker, which suddenly burst causing serious injuries to both, they added.
The injured boys were rushed to Thanjavur Government Medical College hospital, where Keerthivasan was declared brought dead.
However, Yogesh is still under treatment.
A case has been registered, police said.
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