Egyptians pray at the shrine of Sayyeda Zeinab, sister of Imam Hussein, who was the grandson of Islam's Prophet Muhammad and one of the most believed Shiite saints, in Cairo on Tuesday, June 4, 2013. Hatreds between Shiites and Sunnis are now more virulent than ever in the Arab world because of Syria's brutal civil war. Hard-line clerics and politicians on both sides have added fuel, depicting the fight as essentially a war of survival for their sect. (AP Photo/Hassan Ammar)

Photo by: Hassan Ammar

Egyptians pray at the shrine of Sayyeda Zeinab, sister of Imam Hussein, who was the grandson of Islam's Prophet Muhammad and one of the most believed Shiite saints, in Cairo on Tuesday, June 4, 2013. Hatreds between Shiites and Sunnis are now more virulent than ever in the Arab world because of Syria's brutal civil war. Hard-line clerics and politicians on both sides have added fuel, depicting the fight as essentially a war of survival for their sect. (AP Photo/Hassan Ammar)