4 / 20
Egyptian riot police watch over the Coptic cathedral in the early hours of Monday, April 8, 2013, in Cairo, Egypt. Christians angered by the killing of four Christians in weekend sectarian violence clashed Sunday and into Monday with a mob throwing rocks and firebombs, killing one and turning Cairo's main Coptic cathedral into a battleground. The clashes raised tempers in an already tense political atmosphere. (AP Photo)

Clashes in Egypt