A huge explosion took place at a chemical factory at Boisar in Maharashtra's Palghar district on Saturday evening, a police official said.
The factory is located at Kolwade village and the explosion, which took place around 7.20 pm, was so huge that it was heard within a 15-km radius, said police spokesperson Hemant Katkar.
Name of the factory and details about casualties, if any, were yet to be ascertained, he said.
Boisar, over 100 km from Mumbai, houses a Maharashtra Industrial Development Corporation (MIDC) area.
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