Former village head and local BJP leader Shiv Kumar Yadav, his body guard and his driver were shot dead in the Bisrakh area on November 16.
Three people -- Arun Yadav, shooter Naresh and Dharamdutt Sharma -- have already been arrested in the case.
The reward has been announced for information on Sunder Bhati's brother Sahdev and his nephew Anil Bhati, and shooters Amar, Pradeep and Sheru, who are at large, the police said.
The police and Uttar Pradesh Special Task Force (UPSTF) have launched a manhunt to arrest them.
Investigations have revealed Anil Bhati had provided the shooters and planned the attack on the BJP leader, the police said.
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