In Uttar Pradesh, farmers' protests over land acquisition have spread to Agra, Mathura and Aligarh where protestors clashed with police and torched vehicles.Police said, four policemen were injured when farmers turned violent during a protest and indulged in arson in Chaugaan village in Aitmadpur in Agra. Special Director General of Police (Law and Order) Brij Lal said in Lucknow that irate villagers set ablaze several vehicles and tents at a construction site.Farmers are demanding higher compensation for the land acquired by the Mayawati government for the Yamuna Expressway.Cabinet Secretary Shashank Shekhar Singh told reporters that the State government has announced cash rewards for providing any information about some protestors for inciting violence during protests in Bhatta Parsaul village in Delhi's suburb Gautam Buddha Nagar. Four persons including two policemen were killed in clashes between the police and protestors.Claiming that land acquisition or compensation were not the bone of contention, Mr Singh said the incident took place due to “political ambitions” of some persons. He said, 22 persons have been arrested in connection with the clash in Gautam Buddha Nagar.Director General of Police Karamveer Singh said some people also tried to demonstrate in Mathura and Aligarh, but situation remained under control due to “timely police intervention.” Mr Singh said searches were carried out in Bhatta Parsaul and Achchepur villages which were hit by violence yesterday, and some people have been held.Prohibitory orders under Section 144 CrPC have been clamped in Gautam Buddha Nagar district. Areas around the village have been sealed off by the Provincial Armed Constabulary and the dharna site made out of bounds.The police action drew condemnation from BJP, RLD, JD-U, SP and Congress, whose leaders slammed the Mayawati government for the situation.Hitting back at her political opponents, the Chief Minister in a statement criticised the opposition parties for raking up the issue “without verifying facts”.