Coptic Orthodox Christians carry the coffins of men who died during clashes between Muslims and Christians in Khusus, El-Kalubia governorate, during their funeral at the main cathedral in Cairo April 7, 2013. Five Egyptians were killed and eight wounded in clashes between Christians and Muslims in a town near Cairo, security sources said on Saturday, in some of the worst sectarian violence in Egypt for months. REUTERS/Mohamed Abd El Ghany (EGYPT - Tags: CIVIL UNREST RELIGION TPX IMAGES OF THE DAY) 

Coptic Christians run on the roof of the main cathedral in Cairo as police fire tear gas during clashes with Muslims standing outside the cathedral April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: CIVIL UNREST RELIGION TPX IMAGES OF THE DAY) 

Muslims who attended the funeral of the victims of Saturday's clashes between Christians and Muslims in the town of El Khusus pray inside the main cathedral in Cairo, as they are are surrounded by Coptic Christians who are protecting them, during clashes between Muslims and Christians April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: CIVIL UNREST RELIGION) 

A Muslim man gestures towards a drawing, which he said was painted on the Azhari Institute, after clashes between Muslims and Christians in Khusus, El-Kalubia governorate, about 25 km (16 miles) northeast of Cairo, April 6, 2013. Five Egyptians were killed and eight wounded in clashes between Christians and Muslims in the town near Cairo, security sources said on Saturday, in the latest sectarian violence in the most populous Arab state. The violence broke out late on Friday when a group of Christian children were drawing on a wall of the Muslim religious institute, the security sources said. No more details were immediately available. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: POLITICS CIVIL UNREST RELIGION) 

People are seen near a burnt car after clashes between Muslims and Christians in Khusus, El-Kalubia governorate, about 25 km (16 miles) northeast of Cairo, April 6, 2013. Five Egyptians were killed and eight wounded in clashes between Christians and Muslims in the town near Cairo, security sources said on Saturday, in the latest sectarian violence in the most populous Arab state. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: POLITICS CIVIL UNREST RELIGION) 

A Muslim (L) who attended the funeral of the victims of Saturday's clashes between Christians and Muslims in El Khusus shakes hands with a Coptic Christian inside the main cathedral in Cairo to show solidarity during clashes between Muslims and Christians in Cairo, April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

Coptic Orthodox Christians mourn for their relatives who died during clashes between Muslims and Christians in Khusus, El-Kalubia governorate, during their funeral at the main cathedral in Cairo April 7, 2013. Five Egyptians were killed and eight wounded in clashes between Christians and Muslims in a town near Cairo, security sources said on Saturday, in some of the worst sectarian violence in Egypt for months. REUTERS/Mohamed Abd El Ghany (EGYPT - Tags: CIVIL UNREST RELIGION) 

Coptic Orthodox Christians carry the coffins of men, who died during clashes between Muslims and Christians in Khusus in El-Kalubia governorate, during their funeral at the main cathedral in Cairo April 7, 2013. Five Egyptians were killed and eight wounded in clashes between Christians and Muslims in a town near Cairo, security sources said on Saturday, in some of the worst sectarian violence in Egypt for months. REUTERS/Mohamed Abd El Ghany (EGYPT - Tags: CIVIL UNREST RELIGION) 

Coptic Christians remove a picture of Pope Shenoda III from the gate of the main cathedral during clashes with Muslims in Cairo, April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

A Coptic Christian with a Christian tattoo is seen during clashes with Muslims standing outside the main cathedral in Cairo, April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

A man uses a bucket to put out a tear gas canister as Coptic Christians run inside the main cathedral in Cairo, while police fire tear gas during clashes with Muslims standing outside the cathedral April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

Coptic Christians hide behind columns during clashes between Muslims and Christians in the main cathedral in Cairo, April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

Christians scuffle with a police officer (2nd R) outside the Coptic Church in Cairo, after claiming that police forces were not protecting Egyptian minorities, following the funeral of four Christian Copts who were killed during clashes with Muslims in El Khusus, April 7, 2013. Five Egyptians were killed and eight wounded in clashes between Christians and Muslims in a town near Cairo, security sources said on Saturday, in some of the worst sectarian violence in Egypt for months. One Muslim was also killed in the clash. REUTERS/Mohamed Abd El Ghany (EGYPT - Tags: RELIGION CIVIL UNREST) 

A Coptic Christian tries to get help inside the main cathedral in Cairo after he was injured during clashes with Muslims in Cairo, April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

Coptic Christians help a man who was injured by a bullet from a cartridge gun during clashes with Muslims standing outside the main cathedral in Cairo April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

Coptic Christians help an injured man at the main cathedral in Cairo as police fire tear gas during clashes with Muslims standing outside the cathedral April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

Spent tear gas canisters are seen outside the main cathedral in Cairo during clashes in Cairo, April 7, 2013. Clashes broke out between Coptic Christians and Muslims in central Cairo on Sunday after the funeral of four Copts killed in sectarian violence outside the Egyptian capital on Friday night, witnesses said. REUTERS/Asmaa Waguih (EGYPT - Tags: RELIGION CIVIL UNREST) 

The mother of Mohamed Mahmoud holds his clothes and mourns after he was killed during clashes between Muslims and Christians in Khusus, El-Kalubia governorate, about 25 km (16 miles) northeast of Cairo, April 6, 2013. Five Egyptians were killed and eight wounded in clashes between Christians and Muslims in the town near Cairo, security sources said on Saturday, in the latest sectarian violence in the most populous Arab state. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: POLITICS CIVIL UNREST RELIGION)