Ahram Online: Protest against persecution of Copts in Egypt attacked with bloody force
Ahram Online: Egyptian Military attacks Alhurra TV
BBC News: Cairo clashes leave 24 dead after Coptic church protest
EA WorldView: Egypt Latest - At Least 19 Killed in Clashes Over Christian March
Issandr El Amrani at The Arabist blog: Maspero and sectarianism in Egypt
Zeinobia at the Egyptian Chronicles blog: Black Sunday - 1954 Redux
Some Twitter reports and reactions this evening.