Nigerian president Goodluck Jonathan, surrounded by security and members of his delegation at the 12th summit of the OIC, February 6, 2013.
Egyptian President Mohamed Morsi greets Iran's President Mahmoud Ahmadinejad before the opening OIC summit in Cairo, February 6, 2013.
香港学生预演占领中环 (美国之音海彦拍摄)
Iran's Foreign Minister Ali Akbar Salehi (2nd R) talks with other attendees before the start of the OIC summit in Cairo February 6, 2013.
Iran's President Mahmoud Ahmadinejad attends the OIC summit in Cairo, February 6, 2013.
A man holds a sign in Arabic reading, "(Ahmedinejad) You are not welcome in Egypt", in front of the al-Azhar mosque during Ahmedinejad's visit in Cairo, February 5, 2013.
Photographers take pictures of Saudi Crown Prince Salman bin Abdulaziz Al Saud (R) before the start of the Organization of Islamic Cooperation summit in Cairo, February 6, 2013.
Iran's President Mahmoud Ahmadinejad and Egyptian President Mohamed Morsi participate in an arrival ceremony at the airport in Cairo, Egypt, February 5, 2013. (Egyptian Presidency Handout)