India, Sept. 8 -- The Dhar district administration in Madhya Pradesh on Monday ordered a magisterial inquiry into the death of three labourers, who entered an oil tank in a lubricant factory without safety gear, a district police officer said.

The authorities have also sealed the premises operated by the Shri Sagar Lubricant Company in Dhar.

Additional superintendent of police (Addl SP) Vijay Dhabar said the deceased have been identified as Sunil Parmar, 35, Deepak Bhilala, 30 and Jagdish Ninama, 32. A fourth worker, Chotu Parmar, is currently under treatment for inhaling toxic gas.

"Deepak Bhilal entered the tank to clean it on Sunday evening. When he did not return, Jagdish and Sunil followed him into the tank. All three lost conscio...