16 August 2013 Last updated at 12:46 ET
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The BBC's Jeremy Bowen: "Blood-stained stairs in a mosque"
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At least 38 people have been killed in Egypt, officials say, as protesters loyal to ousted President Mohammed Morsi clashed with security forces.
Thirteen people died in Cairo, health and security sources said, with many dead and wounded near Ramses Square.
Two days ago the protesters' camps were broken up, leaving at least 638 dead and causing international condemnation.
Outside Cairo, there are 12 reported deaths in Nile Delta cities and 13 in the rest of Egypt.
In the wake of Wednesday's violence, the interior ministry says police have been authorised to use live ammunition "within a legal framework".
There is also a state of emergency in place, with a curfew starting at 1900 local time (1700 GMT).
'March of Anger'Hundreds of people gathered at a mosque in Ramses Square on Friday, after the Muslim Brotherhood, of which Mr Morsi is a member, appealed to its supporters to join a "march of anger".
The demonstrations are taking place under the slogan "the people want to topple the coup" - referring to the military's removal of Mr Morsi on 3 July.
The protests quickly became violent - the BBC's Jeremy Bowen says the trigger was when a police station came under fire.
He saw at least 12 bodies brought into a mosque near Ramses Square.
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Smoke rises in the distance as protesters gather near a road flyover in Cairo
Protesters are breaking up the pavement in order to throw blocks at the police
Smoke rises near the al-Fath Mosque during clashes at Ramses Square
Fires broke out during clashes between protesters and security forces
Muslim Brotherhood supporters climbed lamp-posts in the square
One supporter of ousted President Morsi is seen with a firearm
Crowds of Brotherhood supporters ran away from tear gas rounds
Wounded protesters were carried away for treatment in makeshift hospitals
A military helicopter could be seen flying above the scene
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Gunfire has also been heard on the banks of the Nile.
Security in the capital is tight, with many armoured personnel carriers on the streets.
Entrances to Tahrir Square, the focus of demonstrations that led to the toppling of President Hosni Mubarak in 2011, were also blocked off by the army.
Members of groups opposed to Mr Morsi - the National Salvation Front and Tamarod - have called for counter-demonstrations in response to the Muslim Brotherhood protests.
There have also been calls for people to protect their neighbourhoods and churches throughout the country.
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A protester in Cairo tells the BBC's Mishal Husain: "We are fighting for the dignity of Egypt"
A human right group, the Egyptian Initiative for Personal Rights, says at least 25 churches were attacked on Wednesday and Thursday.
Some Islamists have accused the Coptic Church of backing Mr Morsi's overthrow.
'Maximum restraint'Wednesday's bloodshed has drawn widespread international condemnation.
Saudi Arabia's King Abdullah issued a statement saying: "The Kingdom of Saudi Arabia, its people and government stood and stands by today with its brothers in Egypt against terrorism."
Mr Morsi, Egypt's first democratically elected president, is in custody accused of murder over a 2011 jailbreak. His period of detention was extended by 30 days on Thursday, state media said.
The BBC's Jeremy Bowen: "Blood-stained stairs in a mosque"
Continue reading the main story
At least 38 people have been killed in Egypt, officials say, as protesters loyal to ousted President Mohammed Morsi clashed with security forces.
Thirteen people died in Cairo, health and security sources said, with many dead and wounded near Ramses Square.
Two days ago the protesters' camps were broken up, leaving at least 638 dead and causing international condemnation.
Outside Cairo, there are 12 reported deaths in Nile Delta cities and 13 in the rest of Egypt.
In the wake of Wednesday's violence, the interior ministry says police have been authorised to use live ammunition "within a legal framework".
There is also a state of emergency in place, with a curfew starting at 1900 local time (1700 GMT).
'March of Anger'Hundreds of people gathered at a mosque in Ramses Square on Friday, after the Muslim Brotherhood, of which Mr Morsi is a member, appealed to its supporters to join a "march of anger".
The demonstrations are taking place under the slogan "the people want to topple the coup" - referring to the military's removal of Mr Morsi on 3 July.
The protests quickly became violent - the BBC's Jeremy Bowen says the trigger was when a police station came under fire.
He saw at least 12 bodies brought into a mosque near Ramses Square.
Continue reading the main story
Continue reading the main story
previous slide next slide
Gunfire has also been heard on the banks of the Nile.
Security in the capital is tight, with many armoured personnel carriers on the streets.
Entrances to Tahrir Square, the focus of demonstrations that led to the toppling of President Hosni Mubarak in 2011, were also blocked off by the army.
Members of groups opposed to Mr Morsi - the National Salvation Front and Tamarod - have called for counter-demonstrations in response to the Muslim Brotherhood protests.
There have also been calls for people to protect their neighbourhoods and churches throughout the country.
A protester in Cairo tells the BBC's Mishal Husain: "We are fighting for the dignity of Egypt"
A human right group, the Egyptian Initiative for Personal Rights, says at least 25 churches were attacked on Wednesday and Thursday.
Some Islamists have accused the Coptic Church of backing Mr Morsi's overthrow.
'Maximum restraint'Wednesday's bloodshed has drawn widespread international condemnation.
- French President Francois Hollande and German Chancellor Angela Merkel have called for urgent European consultations
- EU diplomats will meet in Brussels on Monday - some have called for EU aid to Egypt to be frozen
- EU foreign policy envoy Catherine Ashton said responsibility for the crisis "weighs heavily on the interim government, as well as on the wider political leadership in the country"
- Turkey has described Wednesday's events as a "massacre" and recalled its ambassador to Cairo - in retaliation, Cairo has cancelled naval exercises with Turkey
Saudi Arabia's King Abdullah issued a statement saying: "The Kingdom of Saudi Arabia, its people and government stood and stands by today with its brothers in Egypt against terrorism."
Mr Morsi, Egypt's first democratically elected president, is in custody accused of murder over a 2011 jailbreak. His period of detention was extended by 30 days on Thursday, state media said.