NAPLES, ITALY - JULY 31: Imam Massimo Abdallah Cozzolino delivers a speech during the Holy Mass celebration for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, in the Catholic church of Naples cathedral, in Italy on July 31, 2016. ( Stringer - Anadolu Agency )

NAPLES, ITALY - JULY 31: Muslims and Christians attend Holy Mass celebration for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, in the Catholic church of Naples cathedral, in Italy on July 31, 2016. ( Stringer - Anadolu Agency )

NAPLES, ITALY - JULY 31: Muslims and Christians attend Holy Mass celebration for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, in the Catholic church of Naples cathedral, in Italy on July 31, 2016. ( Stringer - Anadolu Agency )

NAPLES, ITALY - JULY 31: Muslims and Christians attend Holy Mass celebration for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, in the Catholic church of Naples cathedral, in Italy on July 31, 2016. ( Stringer - Anadolu Agency )

NAPLES, ITALY - JULY 31: Muslims and Christians attend Holy Mass celebration for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, in the Catholic church of Naples cathedral, in Italy on July 31, 2016. ( Stringer - Anadolu Agency )

ROME, ITALY - JULY 31: Father Gino Amicarelli (C,) Imam Yahya Pallavicini (2nd L) and a Muslim delegation pose after a Sunday mass at Basilica of the Holy Cross in Jerusalem in Rome, Italy on July 31, 2016. Muslims and Christians attend Sunday mass for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen. ( Riccardo De Luca - Anadolu Agency )

ROME, ITALY - JULY 31: Father Gino Amicarelli (R) greets Imam Yahya Pallavicini (2nd L) and a Muslim delegation after a Sunday mass at Basilica of the Holy Cross in Jerusalem in Rome, Italy on July 31, 2016. Muslims and Christians attend Sunday mass for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen. ( Riccardo De Luca - Anadolu Agency )

ROME, ITALY - JULY 31: Muslims and Christians attend Sunday mass for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, at Basilica of the Holy Cross in Jerusalem in Rome, Italy on July 31, 2016. ( Riccardo De Luca - Anadolu Agency )

ROME, ITALY - JULY 31: Muslims and Christians attend Sunday mass for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, at Basilica of the Holy Cross in Jerusalem in Rome, Italy on July 31, 2016. ( Riccardo De Luca - Anadolu Agency )

ROME, ITALY - JULY 31: Muslims and Christians attend Sunday mass for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen, at Basilica of the Holy Cross in Jerusalem in Rome, Italy on July 31, 2016. ( Riccardo De Luca - Anadolu Agency )

ROME, ITALY - JULY 31: Imam Yahya Pallavicini delivers a speech during a Sunday mass at Basilica of the Holy Cross in Jerusalem in Rome, Italy on July 31, 2016. Muslims and Christians attend Sunday mass for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen. ( Riccardo De Luca - Anadolu Agency )

ROME, ITALY - JULY 31: Monsignor Gianrico Ruzza (L) shakes hands with Imam Yahya Pallavicini (R) during a Sunday mass at Basilica of the Holy Cross in Jerusalem in Rome, Italy on July 31, 2016. Muslims and Christians attend Sunday mass for Father Jacques Hamel, who killed by the attackers who stormed the Catholic church in Sainte Etienne du Rouvray in Rouen. ( Riccardo De Luca - Anadolu Agency )