The incident occurred at around 7.28 am at Bhattipada, a senior police official said.
On getting information about the explosion, police and fire brigade personnel rushed to the spot, he said, adding the injured were taken to a nearby hospital.
However, Nadir Wahab Abdul Pathan, one of the injured was declared dead before admission, he said.
Police have registered a case of accidental death, he said and added the exact reason of the blast is yet to be ascertained.
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