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An Egyptian man stands in an armoured vehicle as residents gather outside a police station in North Sinai's provincial capital of El-Arish after it was targeted by a car bomb on April 12, 2015. The bombing came hours after a roadside blast targeted an army vehicle killing at least six soldiers and wounding two in the peninsula, where security forces are battling an Islamist insurgency. AFP PHOTO / STR (Photo credit should read -/AFP/Getty Images)

An Egyptian man stands in an armoured vehicle as residents gather outside a police station in North Sinai's provincial capital of El-Arish after it was targeted by a car bomb on April 12, 2015. The bombing came hours after a roadside blast targeted an army vehicle killing at least six soldiers and wounding two in the peninsula, where security forces are battling an Islamist insurgency. AFP PHOTO / STR        (Photo credit should read -/AFP/Getty Images)

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An Egyptian policeman runs past some of the remains of a car which exploded in front of a national security building in northern Cairo's district of Shubra on August 20, 2015. A car bomb wounded six Egyptian policemen as it exploded in front of a police building, the interior ministry said, the latest in a wave of militant attacks that has rocked Egypt. AFP PHOTO / KHALED DESOUKI (Photo credit should read KHALED DESOUKI/AFP/Getty Images)

An Egyptian policeman runs past some of the remains of a car which exploded in front of a national security building in northern Cairo's district of Shubra on August 20, 2015. A car bomb wounded six Egyptian policemen as it exploded in front of a police building, the interior ministry said, the latest in a wave of militant attacks that has rocked Egypt.    AFP PHOTO / KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/Getty Images)

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EDITORS NOTE: Graphic content / Egyptian Christians gather around and carry coffins during the late night funeral of the victims of a blast which killed worshippers attending Palm Sunday mass at the Mar Girgis Coptic Orthodox Church in the Nile Delta City of Tanta, 120 kilometres (75 miles) north of Cairo, on April 9, 2017. Egyptian President Abdel Fattah al-Sisi declared a three-month state of emergency in Egypt following twin church bombings that killed dozens of people in two cities on April 9, 2017. The Islamic State (IS) group had claimed responsibility for the church bombings in the Nile Delta cities of Alexandria and Tanta in which at least 44 people were killed. / AFP PHOTO / STRINGER (Photo credit should read STRINGER/AFP/Getty Images)

EDITORS NOTE: Graphic content / Egyptian Christians gather around and carry coffins during the late night funeral of the victims of a blast which killed worshippers attending Palm Sunday mass at the Mar Girgis Coptic Orthodox Church in the Nile Delta City of Tanta, 120 kilometres (75 miles) north of Cairo, on April 9, 2017.
Egyptian President Abdel Fattah al-Sisi declared a three-month state of emergency in Egypt following twin church bombings that killed dozens of people in two cities on April 9, 2017.
The Islamic State (IS) group had claimed responsibility for the church bombings in the Nile Delta cities of Alexandria and Tanta in which at least 44 people were killed. / AFP PHOTO / STRINGER        (Photo credit should read STRINGER/AFP/Getty Images)

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Egyptian security forces stand guard at the site of a bomb attack that targeted the convoy of Egyptian state prosecutor, Hisham Barakat, who died hours after the powerful explosion hit his convoy, in the capital Cairo on June 29, 2015. The bombing came after the Islamic State group's affiliate in Egypt called for attacks on the judiciary following the hanging of six alleged militants. AFP PHOTO / KHALED DESOUKI (Photo credit should read KHALED DESOUKI/AFP/Getty Images)

Egyptian security forces stand guard at the site of a bomb attack that targeted the convoy of Egyptian state prosecutor, Hisham Barakat, who died hours after the powerful explosion hit his convoy, in the capital Cairo on June 29, 2015. The bombing came after the Islamic State group's affiliate in Egypt called for attacks on the judiciary following the hanging of six alleged militants. AFP PHOTO / KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/Getty Images)

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Egyptian emergency personnel move a victim into an ambulance following a car bomb explosion that targeted a police station in North Sinai's provincial capital of El-Arish on April 12, 2015. The bombing came hours after a roadside blast targeted an army vehicle killing at least six soldiers and wounding two in the peninsula, where security forces are battling an Islamist insurgency. AFP PHOTO / STR (Photo credit should read -/AFP/Getty Images)

Egyptian emergency personnel move a victim into an ambulance following a car bomb explosion that targeted a police station in North Sinai's provincial capital of El-Arish on April 12, 2015. The bombing came hours after a roadside blast targeted an army vehicle killing at least six soldiers and wounding two in the peninsula, where security forces are battling an Islamist insurgency. AFP PHOTO / STR        (Photo credit should read -/AFP/Getty Images)