The police resorted to firing in self-defence when some protesting farmers fired at cops clearing the blocked Jind-Hansi road at Gulkani village on Friday afternoon, Jind police chief K K Rao said.
BKU spokesman Baljeet Singh said four farmers were killed in the police firing.
They were Vijender Singh, Parkash alias Dolly, Dilbagh and Maha Singh.
Rao confirmed two deaths.
The farmers' stir spread to other districts, including Hissar, Fatehabad and Rohtak, where also BKU activists blocked roads.
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