Anti-government protesters beat a riot policeman after clashes during the Revolution March in Islamabad September 1, 2014. Pakistan is preparing to launch a selective crackdown against anti-government protesters trying to bring down the government of Prime Minister Nawaz Sharif, the defense minister said, warning demonstrators against storming government buildings. REUTERS/Faisal Mahmood (PAKISTAN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)