Photos of the day. November 21, 2011
Protesters gather in Tahrir Square in Cairo, Egypt, Monday, Nov. 21, 2011. Security forces fired tear gas and clashed Monday with several thousand protesters in Cairo's Tahrir Square in the third straight day of violence that has killed dozens of people and has turned into the most sustained challenge yet to the rule of Egypt's military.(AP Photo/Khalil Hamra)
A collection of the best photos from around the world, updated throughout the day. November 21, 2011
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