Four persons were killed and five others injured after a gas cylinder exploded at a village fair in West Bengal's South 24-Parganas district, police said on Monday.
The incident happened around 10.10pm on Sunday at Bantra village in the Joynagar police station area, around 50 km from Kolkata, they said.
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After a preliminary enquiry, police said the gas cylinder was being used to pump balloons by a balloon seller.
The deceased were identified as Sahin Molla (13), Kutubuddin Mistry(35), Abir Gazi (8) and the balloon seller, Muchiram Mondal (35).
The injured were admitted to the Baruipur Hospital, police said.