Two Coptic kids look on while attending a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

A Coptic boy looks on while attending a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

An Egyptian woman attends a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

A Coptic Father attends a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

Three Coptic boys look on while attending a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

A Coptic boy looks on while attending a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

Egyptian Coptic children attend a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

Egyptian Coptic boys attend a Christmas eve Mass in a Coptic church in Cairo, Egypt, Jan. 6, 2015, one day ahead of the Orthodox Christmas. Egyptian copts celebrated their Christmas Eve here on Tuesday night. (Xinhua/Cui Xinyu)

Female Copts pray at the Saint Samaan Church for Coptic Orthodox Christmas Eve in Cairo,Egypt, on Jan. 6, 2015. (Xinhua/Pan Chaoyue)

Young Copts get dressed during a mass at the Saint Samaan Church for Coptic Orthodox Christmas Eve in Cairo, Egypt, on Jan. 6, 2015. (Xinhua/Pan Chaoyue)

Coptic Pope Tawadros II leads the Coptic Christmas Eve mass at the Saint Mark's Coptic Orthodox Cathedral in Cairo, capital ofEgypt, on Jan 6, 2015. Coptic Pope Tawadros II, head of Coptic Orthodox Church led the mass on the night of Tuesday, which was attended by thousands of Egyptian Coptic Christians. (Xinhua/Ahmed Gomaa)

Choir members sing during the Coptic Christmas Eve mass at the Saint Mark's Coptic Orthodox Cathedral in Cairo, capital of Egypt, on Jan 6, 2015. Coptic Pope Tawadros II, head of Coptic Orthodox Church led the mass on the night of Tuesday, which was attended by thousands of Egyptian Coptic Christians. (Xinhua/Ahmed Gomaa)

A female copt prays during the Coptic Christmas Eve mass at the Saint Mark's Coptic Orthodox Cathedral in Cairo, capital of Egypt, on Jan 6, 2015. Coptic Pope Tawadros II, head of Coptic Orthodox Church led the mass on the night of Tuesday, which was attended by thousands of Egyptian Coptic Christians. (Xinhua/Ahmed Gomaa)

Egyptian Coptic Christians attend the Coptic Christmas Eve mass at the Saint Mark's Coptic Orthodox Cathedral in Cairo, capital of Egypt, on Jan 6, 2015. Coptic Pope Tawadros II, head of Coptic Orthodox Church led the mass on the night of Tuesday, which was attended by thousands of Egyptian Coptic Christians. (Xinhua/Ahmed Gomaa)

Coptic Pope Tawadros II leads the Coptic Christmas Eve mass at the Saint Mark's Coptic Orthodox Cathedral in Cairo, capital of Egypt, on Jan 6, 2015. Coptic Pope Tawadros II, head of Coptic Orthodox Church led the mass on the night of Tuesday, which was attended by thousands of Egyptian Coptic Christians. (Xinhua/Ahmed Gomaa)

Egyptian Coptic Christians attend the Coptic Christmas Eve mass at the Saint Mark's Coptic Orthodox Cathedral in Cairo, capital of Egypt, on Jan 6, 2015. Coptic Pope Tawadros II, head of Coptic Orthodox Church led the mass on the night of Tuesday, which was attended by thousands of Egyptian Coptic Christians. (Xinhua/Ahmed Gomaa)