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CAIRO, EGYPT- JUNE 09: A policeman guards the historical site of the Virgin Mary's Tree in Mataria in front of a painting showing the Holy Family visit during exile in Egypt on june 09, 2006 in Cairo, Egypt. Egyptian authorities have increased security January 6, 2011 as Coptic Christians usher in their Christmas Eve celebrations. Coptic Christians celebrate Christmas according to the Julian Calendar, observing it on January 7 and security has been stepped up after a bombing on New Year's Day targeted a church killing nearly two-dozen people. (Photo by Patrick CHAPUIS/Gamma-Rapho via Getty Images)

CAIRO, EGYPT- JUNE 09: A policeman guards the historical site of the Virgin Mary's Tree in Mataria in front of a painting showing the  Holy Family visit during exile in Egypt on june 09, 2006 in Cairo, Egypt. Egyptian authorities have increased security January 6, 2011 as Coptic Christians usher in their Christmas Eve celebrations. Coptic Christians celebrate Christmas according to the Julian Calendar, observing it on January 7 and security has been stepped up after a bombing on New Year's Day targeted a church killing nearly two-dozen people. (Photo by Patrick CHAPUIS/Gamma-Rapho via Getty Images)