World leaders have spoken out against the violence that has led to the deaths of hundreds of people.
Trouble erupted when the army moved in on a protest camp in the country's capital, Cairo. 525 people were killed.
The camp had been set up by the Muslim Brotherhood - a group who support the former president, Mohammed Morsi.
The army forced Mr Morsi out of power in July following mass demonstrations against him. He had only been in power for a year.
Egypt's current prime minister, Hazem Beblawi, has defended the police's actions, arguing that the authorities had to "restore security".
Egypt's interim government say 525 people died in Wednesday's clashes, but the final figure is likely to be much higher.
The Muslim Brotherhood insists that more than 2,000 people died.
On Thursday, hundreds of Brotherhood members set fire to a government building near Cairo.
'Violence not going to solve anything'
Britain's Prime Minister David Cameron said the violence was "not going to solve anything".
He also said that rule in Egypt needs to change to become "a genuine democracy" and he said "that means a compromise on all sides."
US President Barack Obama has strongly condemned the actions, saying that force was not the way to resolve political differences.
In a statement from the chief of the United Nations, Ban Ki-moon, it said he regretted that the Egyptian authorities had chosen to use force to respond to the demonstrations.
It said Mr Ban was: "well aware that the vast majority of the Egyptian people want their country to go forward peacefully in an Egyptian-led process towards prosperity and democracy."