Riot police face off against demonstrators during protests against poor public services, police violence and government corruption in Sao Paulo June 18, 2013. President Dilma Rousseff on Tuesday sought to defuse a massive protest movement sweeping Brazil, acknowledging the need for better public services and more responsive governance as demonstrations continued in some cities around the country. Monday's demonstrations were the latest in a flurry of protests over the past two weeks.[Photo/Agencies]