A gas leak killed 11 people in India on Sunday, an official said, in the latest deadly industrial accident in the vast developing economy of 1.4 billion people.

The gas leak happened in Giaspura, an industrial area of Ludhiana in the northern state of Punjab.

“Eleven deaths are confirmed,” Mandeep Singh Sidhu, police commissioner of Ludhiana, told reporters, adding that four people were hospitalised.

The cause of the leak was yet to be ascertained, Sidhu added.

“When the blood sample is matched with the sample that the NDRF (National Disaster Response Force) team takes, only then will we be able to tell you the exact cause, which kind of gas,” the police commissioner said.

The six other victims included two boys aged 10 and 13, the report added.

Industrial gas leaks blamed on poor safety standards and insufficient checks are common in India.

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Gas Leak Kills 11 In India