"Such incidents are planned in view of the forthcoming Lok Sabha elections. The communally provocative speeches being made by Chief Minister Adityanath have also created an atmosphere for the mobs to act with impunity," said the CPI(M) in the statement.
The party alleged that the sudden eruption of violent protests amid rumours of cow slaughter "fits the pattern of the Vishwa Hindu Parishad and other Hindutva outfits instigating communal tensions."
Three persons were arrested for their alleged involvement in the mob violence, police said Tuesday.
Twenty-seven people have been named in the FIR, registered around 3 am following the violence Monday, while cases have been lodged against 50 to 60 unidentified people, police officials said.
Of the 27 named, at least four are workers and functionaries of right-wing organisations, including the Bajrang Dal, officials said.