According to the ONTV broadcaster, the explosion occurred at the church's doors, when a suicide bomber was prevented from entering the building by a policeman.
The blast occurred on Palm Day, a Christian feast commemorating the entry of Jesus Christ into Jerusalem. Egyptian media said that Pope Tawadros II, the leader of the Coptic church, was inside the church during the attack. He was not harmed.
💥 Another explosion (believed to be a suicide bomber) at the surroundings of the St. Mark's Cathedral in Alexandria, casualties reported.— Hasan Sari (@HasanSari7) 9 апреля 2017 г.
There were lots of people in both churches — they came to join the divine service.
On December 11, a strong blast hit the Coptic Christian cathedral complex in Cairo, killing 25 and wounding 49 people. Daesh claimed responsibility for the attack.