A blaze in a fireworks factory near Ujjain on Saturday killed 15 workers and seriously burned another four, police said.
The workers were making firecrackers when the fire started, police officer Kishore Gurjar said. It was doused and all the workers were accounted for.
The four workers who were injured suffered burns over 70 to 90 percent of their bodies and were battling for their lives in a hospital, Gurjar said.
Gurjar said the cause of the fire was not immediately known and was being investigated. The factory is near Ujjain, a town in Madhya Pradesh state about 775 kilometers (480 miles) southwest of New Delhi.
Kejriwal, Sisodia, Prashant Bhushan and Shazia Ilmi appeared before Metropolitan Magistrate Sunil Kumar Sharma who recorded Sibal's statement in the matter.