Egypt’s interior ministry identified suicide bomber in Alexandria church attack as 31-year-old Mohamed Hassan Mubarak Abdullah, a resident of Suez province, a statement said on Wednesday.

Abdullah detonated his explosives at the entrance to Saint Mark’s Cathedral, the historic seat of the Coptic Pope, killing 17 people as mass was being conducted. Hours earlier, another bomb tore through a church in Tanta, a city in the Nile Delta.

Egypt’s government imposed a three-month state of emergency in the wake of the attacks.

The interior ministry said in a statement that Abdullah had been a resident of Suez province and used to work for a petroleum company.

It posted a photograph on its Facebook page of a man it said was Abdullah, placing the image alongside a picture taken by a surveillance camera outside the church.

ISIS claimed responsibility for the Palm Sunday attacks, which killed 44 people in total and wounded scores more a week before the Coptic Easter.

The interior ministry said Abdullah had links with the extremist militant cell behind the December suicide bombing on Cairo’s main Coptic cathedral, an attack also claimed by ISIS.

Authorities are still trying to identify the Tanta attacker, the ministry said. It added that security forces killed seven suspected militants in a shootout on Monday as they met to plan attacks on minority Christians.

The statement named 19 other suspected militants believed to belong to the same cells and offered a 100 thousand Egyptian pound ($5,515.72) reward for any information on them.

Sunday’s attacks were the latest against a religious minority increasingly targeted by extremist militants, and a challenge to President Abdel Fattah al-Sisi, who has pledged to protect them as part of his campaign against extremism.

ISIS has waged a low-level war against soldiers and police in Egypt’s Sinai Peninsula for years but it is increasingly targeting Christians and broadening its reach into Egypt’s mainland.

source: Alarabiya