Egyptian protestors clashed with riot police in cities throughout Egypt on Friday during mass rallies marking the second anniversary of the uprising that ousted longtime leader Hosni Mubarak.
In Cairo, thousands of protesters marched towards Tahrir Square, where police fired tear gas on stone-throwing demonstrators attempting to approach a wall that security forces had erected to secure government buildings in the area.
Similar clashes were reported in the cities of Alexandria, Suez and Ismailia.
Egypt's emergency services said more than 100 people were injured in Friday's mass rallies.
The secular-leaning political opposition called for protests Friday against President Mohamed Morsi and the Islamist Muslim Brotherhood party. Opposition leader Mohamed ElBaradei used his Twitter account to call on protesters to "finally achieve the objectives of the revolution."
On Thursday, President Morsi urged people to stay calm and mark the anniversary peacefully. The Muslim Brotherhood has announced it will not take part in celebrations or protests, but will instead launch a charity drive.