An Egyptian protester looks at the damaged Muslim Brotherhood headquarters in Cairo. Protesters stormed and ransacked the headquarters early Monday, in an attack that could spark more violence as demonstrators gear up for a second day of mass rallies. Khalil Hamra/AP hide caption

itoggle caption Khalil Hamra/AP

Protesters chant slogans during a demonstration in front of the presidential palace in Cairo, Egypt, on Sunday. Petr David Josek/AP hide caption

itoggle caption Petr David Josek/AP