The arrests came a day after BKU activists gheraoed the Nehianwala police station on Sunday and forced police authorities to release another accused in the case, Bachittar Singh.
According to sources, family members of three farmers were rounded up but no arrests have been made in the case yet. Notably, all the nine accused farmers are absconding.
The incident took place in Mehma Serja village Friday afternoon when a Public Works Department team led by a sub-divisional engineer Harpreet Sagar reached the village to stop farmers from setting the paddy stubble on fire.