Block Development Officer (BDO) Ashutosh Kumar said three persons died on the spot and four sustained burn injuries in the incident that took place in Milik Phokhar village.
The deceased were identified as Prakash Yadav, Badal Yadav and Anjesh Yadav, he said, adding that their bodies have been sent for post-mortem.
The injured persons were admitted to a government hospital where the condition of two of them was stated to be critical.