At least 10 people have died after a gunman opened fire on a Coptic church near the Egyptian capital, Cairo.
The attacker tried to enter Mar Mina Church in Helwan City, south of Cairo, on Friday. Security forces later killed the gunman.
Local reports said there was a second attacker, and claimed that policemen were among the victims.
Omar Ashour, a visiting professor of security studies at the Doha Institute, said the attack was part of an ongoing crisis in Egypt.
"It's more continuity than change, we still need more details to come up, but so far Egypt has witnessed over 2,000 attacks in the last three years," he said.
"There are two issues one is the political crisis in Egypt which unfolded after 2013. That has not been resolved, and it's creating more and more recruitment and radicalisation to armed groups of various forms."
"There is also basically a series of counterinsurgency and counterterrorism blunders which the Egyptian forces have been committing, and that is adding more and more oil to the fire."
No group has yet claimed responsibility for the attack.
Al Jazeera says, the Islamic State of Iraq and the Levant (ISIL, also known as ISIS) has frequently targeted Egyptian Coptic Orthodox Christians this year.
In May, the armed group attacked Copts travelling to a monastery in central Egypt, killing 29 people. A month earlier, 44 people were killed in bomb attacks at a cathedral and another church on Palm Sunday.