The incident was reported at the Navbharat Fuse Company located in Chote Urla village in Abhanpur block, 40 kilometers away from Raipur.
The blast reportedly took place around 3 am when the explosives kept in a room went off.
The supervisor of the factory who was outside the factory premises at the time of the explosion escaped unhurt and later informed the police about the incident, Raipur Superintendent of Police O P Pal told Press Trust of India.
Mr Pal added that while the cause of the blast is being investigated, a case has been registered in connection with the incident.
A police team has reached the spot and recovered all the bodies, Mr Pal said.
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