Egyptian protesters take cover as they clash with riot police, not seen, near Tahrir Square, Cairo, Egypt, Friday, Jan. 25, 2013. Youth activists and opposition groups have called for large rallies to mark the second anniversary of Egypt's Jan. 25, 2011 uprising that toppled long-time authoritarian leader President Hosni Mubarak. (AP Photo/Khalil Hamra) ORG XMIT: KH126