A massive blaze broke out in a firecracker factory on Saturday in Ujjain, killing at least 15 people, local media said.
Television channels reported the fire began as people were working at the manufacturing plant in Ujjain in Madhya Pradesh. The reports said more than a dozen people had suffered injuries and were in hospital.
Four workers who were injured suffered burns over 70 to 90% of their bodies and were battling for their lives in a hospital, a police official said.
CNN-IBN television said that the death toll was expected to rise. No further details were immediately available.
Many cracker factories are makeshift, sometimes even in people's homes. There are fatal accidents nearly every year as people work in unsafe conditions.