Mr al-Sisi has described it as a heinous terrorist act and promised to bring the perpetrators to justice.
It is the deadliest attack on Egypt's Christian minority in years.
Blast at Cairo church leaves Coptics under siege again
Một phụ nữ đi ngang qua bức tường nhà thờ đầy vết máu Source: AAP
Egyptian president Abdul Fattah al-Sisi has declared three days of national mourning after at least 26 people died in a blast at Cairo's main Coptic cathedral.
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