A boy looks out from a garbage bin as he takes cover during clashes between protesters and troops in Cairo December 16, 2011. Demonstrators armed with stones and petrol bombs clashed with troops wielding truncheons and electric prods in Cairo on Friday, witnesses said, in the worst violence since the start of Egypt’s first free election in six decades. REUTERS/Asmaa Waguih (EGYPT – Tags: POLITICS CIVIL UNREST)