The Oil India tanker overturned in front of the BDO office at Mainaguri along NH 31 last night leading to the leakage of gas.
Electricity was cut off in the area as a preventive measure and efforts are on to cap the leak.
Vehicles were stranded on the National Highway and road communication between the Dooars and Assam and Bhutan was snapped.
Fire brigade personnel from Mainaguri, Malbazar and Jalpaiguri capped the gas leak today and efforts are on to put the tanker back on its wheels, fire brigade sources said.
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