The explosion took place at a gathering on Sunday night on the occasion of a fair at Jaynagar.
Two of the four killed in the explosion were minors.
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Muchiram Mondal (35), the balloon seller, whose helium cylinder exploded, died on spot. The other three, who died in the explosion have been identified -- Shahin Mollah (13), Abir Gazi (8) and Kutubuddin Mistri (35).
A huge police contingent led by the inspector-in-charge of Jaynagar Police Station Rakesh Chakraborty reached the spot immediately. The bodies of the four deceased had been sent for post-mortem.
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The injured people were taken to the nearby Baruipur hospital. The condition of some of them was saif to be critical.
The sub-division police officer of Baruipur Atish Biswas said the police are investigating how the explosion had taken place.
(IANS)
