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Protesters Gather For Tahrir Square Rally

CAIRO, EGYPT - NOVEMBER 22: A protestor suffering from the effects of tear gas is comforted in a make shift medical centre in Tahrir Square on November 22, 2011 in Cairo, Egypt. Thousands of Egyptians have been gathering in Tahrir Square after three days of deadly clashes with security forces despite a promise from Egypt's interim ruling Military council to bring forward Presidential elections. (Photo by Peter Macdiarmid/Getty Images)

Egypt protests in pictures

There has been a fresh wave of violent clashes between demonstrators and police in Tahrir Square, Cairo, amid calls for Field Marshal Hussein Tantawi to step down immediately in favour of an interim civilian council. Four days of protests has seen 38 people killed and scores injured.