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As Egypt went on high alert ahead of Coptic Christmas, Christians and Muslims joined ranks in a mass protest under the watchfull eyes of riot police in the mixed working class district of Shubra in the capital Cairo on January 3, 2011 to condemn the New Year's Eve car bomb attack on a Coptic church in the northern Egyptian city of Alexandria in which 21 people were killed. AFP PHOTO/STR / AFP PHOTO / -