At least 24 people were killed when Christians, angered by a recent church attack, clashed Sunday night with Muslims and security forces outside the state television building in central Cairo.
The officials say Monday's clashes took place outside a Cairo hospital where bodies of Christian victims were kept.
The officials, who spoke on condition of anonymity because they were not authorized to speak to the media, had no word on casualties.
The latest violence comes hours before funeral services for the victims were to be held at the Coptic Christian cathedral in Cairo.
