People react in anger following an explosion at Saint Mark's Cathedral in the coastal city of Alexandria, the historic seat of Christendom in Egypt, Sunday, April 9, 2017 AP
Egyptians walk past blood stains in a street near a church in Alexandria after a bomb blast struck worshippers gathering to celebrate Palm Sunday on April 9, 2017 AFP
Egyptians gather at near a church in Alexandria after a bomb blast struck worshippers gathering to celebrate Palm Sunday on April 9, 2017 AFP
The aftermath of the suicide bombing in Alexandria, Egypt, April 9, 2017 Reuters
A general view shows forensics collecting evidence at the site of a bomb blast which struck worshippers gathering to celebrate Palm Sunday at the Mar Girgis Coptic Church in the Nile Delta City of Tanta, 120 kilometres (75 miles) north of Cairo, on April 9, 2017 AFP
A woman looks on after an explosion hit Saint Mark's Cathedral in the coastal city of Alexandria, the historic seat of the Coptic Orthodox Church in Egypt, Sunday, April 9, 2017 AP
A general view shows people gathering outside the Mar Girgis Coptic Church in the Nile Delta City of Tanta, 120 kilometres (75 miles) north of Cairo, after a bomb blast struck worshippers gathering to celebrate Palm Sunday on April 9, 2017 AFP
People react at the site of a bomb blast which struck worshippers gathering to celebrate Palm Sunday at the Mar Girgis Coptic Church in the Nile Delta City of Tanta, 120 kilometres (75 miles) north of Cairo, on April 9, 2017 AFP
A general view shows forensics collecting evidence at the site of a bomb blast which struck worshippers gathering to celebrate Palm Sunday at the Mar Girgis Coptic Church in the Nile Delta City of Tanta, 120 kilometres (75 miles) north of Cairo, on April 9, 2017 AFP
A relative of one of the victims reacts after a church explosion killed at least 21 in Tanta, Egypt, April 9, 2017 Reuters
A relative of one of the victims reacts after a church explosion killed at least 21 in Tanta, Egypt, April 9, 2017 Reuters