EGYPT, Cairo : Egyptian anti-government protesters calling for the ouster of President Hosni Mubarak block an Egyptian army armoured personnel carrier (APC) at Tahrir Square in Cairo on February 5, 2011. Protesters sat on the ground around some of the tanks to prevent the troops pulling out and leaving the square vulnerable to the feared interior ministry riot police or militants loyal to Mubarak's ruling National Democratic Party.© ALESSIO ROMENZI