The incident took place last night and the injured were admitted to MKCG Medical College and Hospital here.
Inspector-in-charge, Chhatrapur police station Bishnu Prasad Patra said preliminary investigation revealed that the explosion took place when some people were making the crude bombs. Three of the injured persons, have criminal records.
Police, however, ruled out possibility of the bombs being made for use during the panchayat polls.
"It's not related to panchayat elections," said Patra adding the accused persons have been identified and they would be arrested soon.
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