Sectarian violence struck Egypt again on Friday, April 6, as at least four Christians and one Muslim were killed in an incident in Khusūs, in the governorate of Qalyubia, to the north of Cairo. Clashes continued on Sunday, and spread to the Coptic Orthodox Cathedral in downtown Cairo, where a funeral procession was attacked by unknown assailants. Religious and political leaders have condemned the violence and called for calm, but much about the original incident remains unclear.