A massive fire broke out at the Bharat Petroleum Corporation Limited-RMP plant in Mumbai's Chembur on Wednesday injuring at least 45 workers.
Nine fire tenders, two foam tenders and two jumbo tankers were pressed into service to douse the blaze.
The fire was brought under control after three hours, a Mumbai Fire Brigade official said, adding that cooling operations were underway.
Locals in the area staged a protest after the incident, saying a similar accident in the future could turn out to be more devastating.
Forty-five workers were injured in the incident, Shahaji Umap, Deputy Commissioner of Police (Zone-VI), said.
After preliminary treatment at the BPCL's first aid centre, 22 of them were allowed to go home, while others were shifted to a nearby hospital in Chembur, he said.
The incident took place in the "Compressor shed of Hydrocracker plant", as per the company's statement.
(With inputs from PTI)