At least 12 people have died in central Cairo, as supporters of ousted Morsi clash again with security forces.
The BBC’s Jeremy Bowen said he had seen 11 bodies and many people badly injured near central Ramses Square.
Two days ago the protesters’ camps were broken up, leaving at least 638 dead .
At least 12 people have also been killed in protests outside Cairo.
Eight people were reportedly killed in Damietta, and four in Ismailia.
In the wake of Wednesday’s violence, police have been authorised to use live ammunition in self-defence.
Protests quickly became violent – according to our correspondent the trigger was when a police station came under fire.
He said he could hear tear gas being used and then live ammunition – long bursts of automatic fire.
From where he is standing – near a mosque not far from the square – he said he could see many casualties being brought in for help.
“Egypt is in a deepening, really serious crisis – I can’t see how they can get out of it without a lot more violence and death,” he said.
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 reported to have been blocked off by the army.
State TV said the military was deploying to protect “important and vital facilities”.
Members of groups opposed to Morsi – the National Salvation Front and Tamarod – are reported to have called for counter-demonstrations in response to the “Muslim Brotherhood” protests.
There have also been calls for people to protect their neighborhoods and churches throughout the country.
Meanwhile, Egypt’s interim leaders have criticised remarks by President Barack Obama on Thursday.
The Egyptian presidency said in a statement in the early hours of Friday that Mr Obama’s words were “not based on fact” and would “embolden armed groups”.
It said Egypt was facing “terrorist acts”.
R.S