An overnight fire in Mumbai killed 12 workers early Monday at a shop that made and sold fried snacks, according to Indian media reports.

A survivor, 28-year-old Tushar Pawar, told The Associated Press that he saw the fire in the center of the workshop area about 4 a.m.

"Those who were outside were able to move out, but those who were inside, they were trapped and could not come out," he said.

A disaster management official told the Press Trust of India news agency that 12 workers succumbed to the intense heat and smoke.

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A police officer stands guard as fire officials clear the debris from a burnt down shop in Mumbai, Monday, Dec. 18, 2017. (AP)

Those workers were taken to a hospital and declared dead on arrival, authorities said.

Investigators were trying to determine the cause of the fire, which gutted the workshop area and the shop itself. It made "farsan," a salty snack enjoyed with tea.

The Associated Press contributed to this report.