In a show of defiance to the military authorities in Egypt, the toppled Moslem Brotherhood have called upon its supporters to come out and continue demonstrations after Friday prayers.
This call comes two days after authorities broke up Muslim Brotherhood protest camps in the Egyptian capital with the loss of at least 638 lives.
On Wednesday, violence erupted after military authorities in Egypt ordered armoured bulldozers to move into the two Cairo protest camps.
Nahda square, which was the smaller of the two camps was cleared quickly but the story was not the same at Rabaa al-Adawiya mosque, the bigger of the two camps where violence raged for several hours. The mosque was subsequently destroyed by fire.
The call by the Egyptian interim Prime Minister, calling on the authorities to restore security did little to appease the situation.
A state of emergency has been declared and the police were issued with authority to use live ammunition to defend themselves.
The Moslem Brotherhood leaders say they will hold marches under the slogan “the people want to topple the coup”.
Egyptians, especially members of the Coptic Christian community, have been asked to protect their neighbourhoods and churches throughout the country.
Some Islamists accuse the Christian sect of backing the military action which led to Morsi’s overthrow.
The BBC’s Bethany Bell in Cairo says Egyptians will be watching to see if the Brotherhood will gain some fresh momentum after the crackdown on Wednesday – or if the army will strengthen its grip on power.
Reports say there were renewed attacks on security forces on Thursday, with at least seven soldiers and a policeman killed in the Sinai peninsula and another police officer killed in the central city of Assuit.
Meanwhile, President Obama’s condemnation of the attacks has been criticised by Egypt’s interim leaders.
The Egyptian presidency said in a statement on Friday that Mr Obama’s words were “not based on fact” and would “embolden armed groups
It said Egypt was facing “terrorist acts”.
On Thursday, Mr Obama condemned the government’s actions in ordering security forces to break up the protest camps, and cancelled joint military exercises.
He said co-operation could not continue while civilians were being killed. However, he stopped short of cutting $1.3bn (£830m) in aid that the US gives to Egypt.
On the other hand, Obama’s refusal to cut off aid to Egypt has attracted condemnation from his Republican opponent during the 2008 Presidential election, Senator John McCain. He told BBC Newsnight that the ousting of President Morsi was a “coup” and President Obama should have cut off aid to Egypt as a result.
The US has been careful not to use the word coup as under US law this would mean stopping aid.
“I am confused that we would not enforce our own laws,” he said.
“That sends a message of tolerance of brutality, of ineffective American leadership to the Muslim world, that the United States of America at least condones this kind of behaviour, which we cannot.”
Mr Morsi, Egypt’s first democratically elected president, is in custody charged with murder over a 2011 jailbreak. His period of detention was extended by 30 days on Thursday, state media said.