Egyptian authorities today identified the second bomber who blew himself up during a Palm Sunday service at a Coptic Christian church in the northern city of Tanta.
The interior ministry identified the attacker has been identified as 40-year-old Mamdouh Amin Mohamed Baghdady, who lived in the upper Egyptian City of Qena.
It said he was a member of a "terrorist" cell, and announced the arrest of three other members of the cell.
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The attacker was identified as Mahmud Hassan Mubarak Abdullah, born in Qena in 1986.
At least 46 people were killed and more than 120 others injured in the twin bombings that hit Egypt's St George Cathedral in Tanta and St Mark's Cathedral in Alexandria on Palm Sunday.
The Islamic State claimed responsibility for the attacks.
The ministry said Abdallah and Baghdady were associates of Amr Saad Abbas Ibrahim, a fugitive who is the leader of a terrorist cell that orchestrated last December's deadly suicide bombing of Cairo's St Peter and St Paul's Church, which killed 29 worshipers, mostly women and children.
Coptic Christians make up about 10 per cent of Egypt's population of 85 million. Egypt's Christian minority has often been targeted by Islamist militants.
Egypt has seen a wave of attacks by militants since 2013 when the military toppled president Mohammed Morsi, an elected leader who hailed from the Muslim Brotherhood, and launched a crackdown against Islamists.
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