Egyptians pray on the Tahrir Square during a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, in Cairo, Egypt, Jan. 25, 2014. (Xinhua/Cui Xinyu)

 

A man hits a damaged poster of ousted Islamic president Mohamed Morsi with his shoe during a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

A man takes photos of a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

Egyptians attend a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

A military helicopter hovers over people during a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

An Egyptian girl waves an Egyptian national flag during a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square Cairo, Egypt, Jan. 25, 2014. (Xinhua/Cui Xinyu)

 

Egyptians attend a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

Egyptians attend a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

A woman wears a mask of Egyptian Defense Minister Abdel Fattah al-Sisi during a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Cui Xinyu)

 

Egyptians stand in line to leave Tahrir Square after attending a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

People pass a giant poster of Egyptian Defense Minister Abdel Fattah al-Sisi during a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

Egyptians attend a celebration event marking the third anniversary of the revolution toppling former President Hosni Mubarak, on Tahrir Square, Cairo, Egypt, Jan. 25, 2014. (Xinhua/Pan Chaoyue)

 

A helicopter is seen during the celebration on the capital's symbolic Tahrir square in Cairo, Jan. 25, 2014. Egyptians held rallies to mark the third anniversary of an upheaval that toppled the 30-year ruler Hosni Mubarak on Saturday. (Xinhua/Cui Xinyu)

 

A helicopter is seen during the celebration on the capital's symbolic Tahrir square in Cairo, Jan. 25, 2014. Egyptians held rallies to mark the third anniversary of an upheaval that toppled the 30-year ruler Hosni Mubarak on Saturday. (Xinhua/Cui Xinyu)

 

Egyptians wave national flag during a rally on the capital's symbolic Tahrir square in Cairo, Egypt, Jan. 25, 2014. Egyptians held rallies to mark the third anniversary of an upheaval that toppled the 30-year ruler Hosni Mubarak on Saturday. (Xinhua/Cui Xinyu)

 

A woman wears a mask during a rally on the capital's symbolic Tahrir square in Cairo, Egypt, Jan. 25, 2014. Egyptians held rallies to mark the third anniversary of an upheaval that toppled the 30-year ruler Hosni Mubarak on Saturday. (Xinhua/Cui Xinyu)

 

Egyptians wave national flag during a rally on the capital's symbolic Tahrir square in Cairo, Egypt, Jan. 25, 2014. Egyptians held rallies to mark the third anniversary of an upheaval that toppled the 30-year ruler Hosni Mubarak on Saturday. (Xinhua/Cui Xinyu)

 

A man waves Egyptian flag during a rally on the capital's symbolic Tahrir square in Cairo, Egypt, Jan. 25, 2014. Egyptians held rallies to mark the third anniversary of an upheaval that toppled the 30-year ruler Hosni Mubarak on Saturday. (Xinhua/Cui Xinyu)

 

A boy is seen during a rally on the capital's symbolic Tahrir square in Cairo, Egypt, Jan. 25, 2014. Egyptians held rallies to mark the third anniversary of an upheaval that toppled the 30-year ruler Hosni Mubarak on Saturday. (Xinhua/Cui Xinyu)