The officials said the shooting happened yesterday night at Coptic Christian church holding a wedding in the Waraa neighborhood of Cairo.
Authorities had begun an investigation into the shooting and offered no motive for the attack. They spoke on condition of anonymity as they weren't authorized to speak to journalists.
Egypt has been on edge since a July 3 military coup ousted the country's Islamist president. Since the coup, Coptic Christians have been killed and their churches attacked by angry mobs.