Protesters gather outside the Muslim Brotherhood headquarters in Cairo, Friday, March 22, 2013. Thousands of opponents and supporters of Egypt's powerful Muslim Brotherhood clashed Friday near the Islamist group's Cairo headquarters, where riot police guarded the building. Young men threw stones and chanted against Islamist President Mohammed Morsi and his Muslim Brotherhood supporters near the office. Some wielded tree branches and broken bottles. (AP Photo/Khalil Hamra)

Associated Press
Protesters gather outside the Muslim Brotherhood headquarters in Cairo, Friday, March 22, 2013.  Thousands of opponents and supporters of Egypt's powerful Muslim Brotherhood clashed Friday near the Islamist group's Cairo headquarters, where riot police guarded the building. Young men threw stones and chanted against Islamist President Mohammed Morsi and his Muslim Brotherhood supporters near the office. Some wielded tree branches and broken bottles. (AP Photo/Khalil Hamra)
Protesters gather outside the Muslim Brotherhood headquarters in Cairo, Friday, March 22, 2013. Thousands of opponents and supporters of Egypt's powerful Muslim Brotherhood clashed Friday near the Islamist group's Cairo headquarters, where riot police guarded the building. Young men threw stones and chanted against Islamist President Mohammed Morsi and his Muslim Brotherhood supporters near the office. Some wielded tree branches and broken bottles. (AP Photo/Khalil Hamra)
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