Reuters caption:

"Anti-government protesters take part in Friday prayers at Tahrir Square in Cairo February 4, 2011. Tens of thousands of Egyptians prayed in Cairo's Tahrir (Liberation) Square on Friday for an immediate end to President Hosni Mubarak's 30-year rule, hoping a million more would join them in what they called the Day of Departure. REUTERS/Amr Abdallah Dalsh"

The photo was copied from the web page http://totallycoolpix.com/2011/02/egypt-protests-anti-mubarak-vs-pro-mubarak-riots/ where it is picture #69. It has been checked against the Reuters original; the picture and caption are identical. 

This photo is (C) REUTERS 2011.  It is reproduced here for educational purposes, for Fair Use Only.