A young demonstrator sits on a windowsill during a protest against the regime of Egypt's President Hosni Mubarak outside the Egyptian Embassy in London February 5, 2011. The leadership of Egypt's ruling party quit on Saturday after protests that have rocked the political establishment, but protesters dismissed the move as a ruse that would not deter them from their goal of toppling the president. REUTERS/Luke MacGregor (BRITAIN - Tags: CIVIL UNREST POLITICS)