The toll in the gas cylinder explosion in Giaspura locality here went up to four after one person succumbed to injuries, police said today.
Ram Naresh (42) who had suffered 55 per cent burn injuries passed away at Guru Teg Bahadur Charitable Hospital, said ACP (South) Dharam Pal.
He said 12 people were admitted at Christian Medical College and Hospital (CMCH) and four at Dayanand Medical College and Hospital (DMCH) in serious condition.
"We have filed inquest proceedings under section 174 of the CrPC in death cases," he said.
On Thursday, a gas cylinder had exploded at a residence in Samrat Colony of Giaspura area of Ludhiana injuring at least 34 people.
The cylinder had exploded at the residence of one Ashok Kumar Yadav (58) who was admitted at CMCH with 70 per cent burns.
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His wife Sunita (40) and son Raj (13) died in this incident.
Their two daughters Kajal and Pooja were also undergoing treatment at CMCH and both were stated to be critical.