Police arrested four people and were hunting for a Bajrang Dal activist in connection with the mob violence in Bulandshahr that left an inspector and a passerby dead, as angry families demanded action amid criticism of the UP chief minister and suggestions of conspiracies.

A mob of some 400 people, including right-wing activists, fought pitched battles with the police on Monday in Siana area of Bulandshahr district, apparently after right-wing activists got angry when they found cow carcasses strewn in a nearby jungle. They set fire to dozens of vehicles, hurled stones and also fired guns at the police who retaliated with gunfire. In the violence, Inspector Subodh Kumar Singh, the station house officer of Siana, and 20-year-old Sumit Kumar were killed.