A bombing near the Coptic cathedral in the Egyptian capital Cairo has killed at least 25 people, officials say.
Dozens of others were injured in the blast at St Peter's church during a Sunday church service.
The church is adjacent to St Mark's cathedral, within the same complex. Photos and video footage showed damage to the church, with shattered windows and broken roofing.
The explosion happened at 10:00 (08:00 GMT) on Sunday.
Video sourced by regional media appeared to show the interior of the church littered with broken and scattered furniture, along with blood and clothing on the floor.
"I saw a headless woman being carried away,'' one eyewitness told the Associated Press. "Everyone was in a state of shock."
"There were children. What have they done to deserve this? I wish I had died with them instead of seeing these scenes,'' she said.
Egypt's Coptic Christians make up about 10% of the country's population.
St Mark's Cathedral is the headquarters of the country's Orthodox church, and the home of its leader, Pope Tawadros II.
By lunchtime, a crowd of protesters had gathered outside the cathedral complex. Police kept the area tightly cordoned off.
On Saturday, six policemen were killed when a bomb exploded on a main road leading to the pyramids at Giza.
The explosion, at a police checkpoint, was the deadliest attack on security forces in Cairo in over six months.
A recently formed militant group called Hasm said it carried out the attack.
Egypt's Coptic Christian minority have complained of discrimination in the mostly Muslim nation.
Two people were killed outside St Mark's cathedral in 2013, when people mourning the death of four Coptic Christians killed in religious violence clashed with local residents.
February this year, a court sentenced three Christian teenagers to five years in prison for insulting Islam. The teenagers had appeared in a video, apparently mocking Muslim prayers, but claimed they had been mocking the Islamic State group following a number of beheadings.
Egypt has pursued a number of blasphemy cases since the country's 2011 uprising. Many of those cases have been against Copts.
The government of President Sissi came to power following the overthrow of Mohammed Morsi in 2013. It outlawed the Muslim Brotherhood, that now is hiding in plain sight in US supported Turkey which is alas strangely a NATO member. President Sissi has been battling insurgent Islamic groups ever since.
Most of the militant attacks have been focused in the Sinai province, where an IS-linked jihadist group is active, kidnapping and torturing innocent African mostly Muslim refugees on a daily basis to finance their sick efforts. Cairo has also suffered a string of attacks in the past two years…..
The only thing that can stop this is if US and EU would throw Turkey out of NATO and close the doors to EU where they have had the Turkish leadership has had the nerve to threaten EU to let loose the refugees...So far EU has been not seen all the facts and we at SDR know that still today Turkey rather openly let radicals sell Syrian passports to radicals of any Islamic nation as a western journalist already has bought one and published it .
Feel free to google it. Turkey is home of Hamas and the Egyptian Brotherhood and any other terrorist group and should become levelled as such !
All we can say on SDR is: Turkey - We see you and what you do!