No casualties were reported in the fire, but it caused losses of several million taka, the traders say
The incident was reported on Sunday from Mathhabhanga neighbourhood in Charbhadrasan Upazila.
The victims are Sheikh Arzan, 45, his wife Anwara Begum, 35, daughter Bithi Akter, 15 and Billal Molla, 40, said Charbhadrasan police OC Ram Prasad Bhakta.
All of them were plucking peanuts from a field when lightning struck them, he said quoting locals.
Arzan, his wife and daughter died on the spot while Billal died after being rushed to Charbhadrasan Upazila Health Complex.