Protesters help an injured man clutching a Guy Fawkes mask after scuffles broke out between groups of protesters in Tahrir square when chants against the new Islamist president angered some in the crowd in Cairo, Egypt, Friday, Oct. 12, 2012. Thousands of supporters and opponents of Egypt's new Islamist president clashed in Cairo's Tahrir Square on Friday, hurling stones and concrete and swinging sticks at each other in the first such violence since Mohammed Morsi took office more than three months ago. (AP Photo/Khalil Hamra)

Photo by: Khalil Hamra

Protesters help an injured man clutching a Guy Fawkes mask after scuffles broke out between groups of protesters in Tahrir square when chants against the new Islamist president angered some in the crowd in Cairo, Egypt, Friday, Oct. 12, 2012. Thousands of supporters and opponents of Egypt's new Islamist president clashed in Cairo's Tahrir Square on Friday, hurling stones and concrete and swinging sticks at each other in the first such violence since Mohammed Morsi took office more than three months ago. (AP Photo/Khalil Hamra)