The attack killed 25 people, mainly women, and has not been claimed by any armed group. President Abdel-Fattah el-Sissi on Monday identified the bomber as 22-year-old Mahmoud Shafiq Mohammed Mustafa.
The video is a recording of CCTV footage from outside a chapel adjacent to St Mark's Cathedral, seat of Egypt's ancient Coptic Orthodox Church. It shows a dark figure crossing the street and walking through the gates of the church. Moments later, the blast sends clouds of dust and debris through the windows.
Since then, Islamic militants have carried out scores of attacks, mainly targeting the security forces, while the government has waged a wide-scale crackdown on dissent.
Small protests were held outside the church in the aftermath of the attack, as Christians accused the government of failing to protect them, a complaint that goes back many years.
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"How did all this planning take place without the security knowing about it?" he said. "You are saying that this person belongs to a terror group and has been previously arrested... So you should have kept a close eye on him."
The Interior Ministry said late yesterday that the attacker belonged to a terror cell founded by an Egyptian doctor and funded by Muslim Brotherhood leaders living in exile in Qatar. It said the cell was tasked with staging attacks that would stir sectarian strife.
The Brotherhood condemned the bombing.
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