The mishap took place while the victims were returning from work at a stone quarry last evening, police said.
The deceased were identified as Narayan Sahu (35) of Subalaya, Sushant Sahu (42) of Kaniara and Bhasi Nahak (51) of Bhejiput, said Inspector In-Charge of Kabisurya Nagara police station, B K Pradhan.
The two persons who suffered burn injuries were admitted to Aska hospital and their condition was stated to be serious, police said.
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