A protester part of the Black Bloc, holds the Egyptian national flag during clashes with riot police near Tahrir Square, Cairo, Egypt, January 28, 2013. An unpredictable new element has entered Egypt’s wave of political unrest, a mysterious group of black-masked young men calling themselves the Black Bloc. AP

A masked Egyptian protester part of the Black Bloc, flashes the victory sign during clashes with riot police, background, near Tahrir Square, Cairo, Egypt. AP

An Egyptian protester with Arabic writing on his shirt that reads, "down down, with the rule of the supreme leader," throws a tear gas canister back at riot police, not seen, during clashes near Tahrir Square, Cairo, Egypt. AP

Egyptian protesters run for cover during clashes with riot police near Tahrir Square, Cairo, Egypt. AP

Former Egyptian presidential candidate, Hamdeen Sabahi, left, speaks during a press conference following the meeting of the National Salvation Front as former director of the U.N.'s nuclear agency and Nobel peace laureate, Mohamed El Baradei, center, and former Egyptian Foreign Minister and presidential candidate, Amr Moussa, right, listen in Cairo, Egypt. AP

Egyptians attend the funeral of several Sunday victims of ongoing violence in Port Said, Egypt. AP

Another shot of Egyptians attending the funeral of several victims of ongoing violence in Port Said, Egypt. AP

An Egyptian youth performs prayers on Qasr Al-Nile bridge leading to Tahrir Square, Cairo, Egypt. AP

Egyptian protesters clash with riot police, unseen, near Tahrir Square, Cairo, Egypt. AP

An Egyptian protester throws a tear gas canister back at riot police, not seen, during clashes near Tahrir Square, Cairo, Egypt. AP

An Egyptian protester evacuates an injured man, left, during clashes with riot police near Tahrir Square, Cairo, Egypt. AP

An Egyptian protester covers his face with a plastic bag during clashes with riot police, not seen, near Tahrir Square, Cairo, Egypt. AP

An Egyptian protester reacts from tear gas during clashes with riot police, not seen, near Tahrir Square, Cairo, Egypt. AP

A protester prepares to throw a rock while surrounded by tear gas and smoke during clashes with security forces near Tahrir Square in Cairo, Egypt. AP

Egyptian protesters clash with police, unseen, in Port Said, Egypt. AP

Egyptians chant slogans during a mass funeral in Port Said, Egypt. AP

Egyptian riot police arrest a protester during clashes near Tahrir Square, Cairo. AP

Relatives of Egyptian policemen who were killed in Port Said violence grieve during their military funeral in Cairo, Egypt. AP

Egyptian policemen march during their colleagues military funeral, who were killed in the Port Said violence, in Cairo, Egypt. AP

Egyptian pro-government protesters destroy tents during clashes near Tahrir Square, Cairo, Egypt. AP