President Abdul Fattah al-Sisi has inaugurated Egypt's largest cathedral in the new administrative capital east of Cairo, a day after a deadly bomb blast near a Coptic church.
The newly built Cathedral of Nativity had its first Mass under heavy security on Sunday, the eve of Coptic Christmas.
On Saturday, a policeman died trying to defuse an explosive device hidden on a roof in Nasr City outside Cairo.
Copts make up about 10% of Egypt's Muslim-majority population.
Many say the state discriminates against them and does not offer them enough protection.
Mr Sisi, who declares himself a defender of Christians against extremists, told worshippers the simultaneous opening of the cathedral and the major Al-Fattah Al-Aleem mosque carried a message of unity.
"We are one and we will remain one," Mr Sisi said as he opened the cathedral, referring to Egyptian Christians and Muslims.
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Pope Francis extended greetings to Pope Tawadros II of Alexandria, the head of the Coptic church, who later led a midnight mass.
The newly built Al-Fattah Al-Aleem Mosque will be able to accommodate almost twice that of the cathedral, both of which are located in the major development that is the new administrative capital.
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