Angered by the killing in the lock-up, a mob attacked the Kotkhai police station.
Prime Minister Narendra Modi on Saturday attended the pre-wedding ceremony of Samajwadi Party supremo Mulayam Singh Yadav's grandnephew with Rashtriya Janata Dal chief Lalu Yadav's daughter, an event which saw the most powerful political families of Uttar Pradesh and Bihar coming together.
In view of the volatile situation, the Centre rushed 1,100 personnel of anti-riot Rapid Action Force.
The bodies of four police officials, who were abducted on Monday by Naxals, were found in Chhattisgarh's insurgency-hit Bijapur district on Wednesday.
A man demanding reservation for the community jumped to his death in a river in Aurangabad district.