Protesters gather at Tahrir Square, the focal point of the Egyptian uprising, during a protest against presidential candidates Mohamed Mursi and Ahmed Shafiq in Cairo May 28, 2012. A group of Egyptian protesters set fire to the campaign headquarters of presidential candidate Ahmed Shafiq in Cairo on Monday, the state news agency reported, after the ex-prime minister made it into the second round of the vote. REUTERS/Mohamed Abd El Ghany (EGYPT - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)