The Uttar Pradesh police have named a general secretary of the Nishad party, an ally of the SP-BSP in the state, as the main accused in the murder of a policeman by a mob in Ghazipur, a couple of hours after Prime Minister Narendra Modi addressed a rally in the district. Twenty-seven people have been arrested so far in connection with the case. All of them were part of the mob that threw stones at the police and hit them with sticks, an officer said.