Protesters clash with riot police in Tahrir Square, Cairo – in pictures

An Egyptian protester collects stones to throw at riot police during clashes in Tahrir Square Photograph: Khaled Desouki/AFP/Getty Images

Egyptian protesters flee as teargas is fired at them by riot police Photograph: Khaled Desouki/AFP/Getty Images

An Egyptian protester kicks a teargas canister Photograph: Nasser Nasser/AP

An Egyptian protester helps an injured fellow protester during clashes with security forces Photograph: Nasser Nasser/AP

Protesters carry an injured man in Tahrir Square Photograph: Asmaa Waguih/Reuters

Egyptian protesters look on after Egyptian security forces, unseen, fire teargas at them Photograph: AP

Demonstrators throw stones during clashes with Egyptian security forces in Tahrir Square Photograph: Khalil Hamra/AP

Egyptian protesters throw stones at riot police Photograph: Khaled Desouki/AFP/Getty Images

Egyptians carry a young man who was injured during clashes between protesters and police forces Photograph: Mohamed Omar/EPA

Demonstrators throw stones at police during clashes with the Egyptian security close to the interior ministry in Cairo Photograph: Khalil Hamra/AP