The United States has called for the release of ousted Egyptian president Mohamed Morsi, who has been held in custody by the army since last week.
Thousands of Muslim Brotherhood supporters today took to the streets of Cairo to demand Morsi's reinstatement.
ITV News Middle East Correspondent John Ray reports.
The US State Department has called on Egypt to release the deposed president Mohamed Morsi from detention, Reuters reports.
Germany's Foreign Ministry has urged all political parties in Egypt to refrain from violence or threats of violence, and called on Egyptian authorities to allow an international organisation access to ousted Islamist president Mohamed Morsi. A ministry spokesman said:
All forms of political persecution would be extremely damaging for the future of Egypt.
We call for an end to the restrictions on Mr Morsi, and we also urge all political powers, in particular the leaders of the Muslim Brotherhood, to refrain from all forms of violence or threat of violence
Egypt's interim prime minister told Reuters he hopes to swear in his new cabinet by the end of next week.
Hazem el-Biblawi, a liberal economist and former finance minister, said he will begin contacting candidates on Sunday and Monday.
He was named interim prime minister after Egypt's army deposed president Mohamed Morsi last week.
Muslim Brotherhood supporters are gathering in large numbers in Cairo ahead of Friday prayers and protests.
Rival demonstrations supporting the overthrow of Mohamed Morsi are also planned.
Everyone is wondering whether this will be another day that ends in violence.
Supporters of deposed Egyptian president Mohamed Morsi are continuing to hold a mass sit-in at Cairo's Rabaa Al Adaweya mosque.
Thousands of people turned out to pray this evening at the end of the first day of Ramadan - the Islamic holy month of fasting.
Earlier, a spokesman for the Muslim Brotherhood accused Egypt's authorities of trying to break up the sit-in by issuing arrest warrants for some of the group's leaders.
He said that the warrants had not been acted on so far.
A group of wealthy Gulf states have promised Egypt £12 billion in aid to stave off the country's growing economic crisis, Reuters reports.
The grants and loans unveiled by Saudi Arabia, the United Arab Emirates and Kuwait should boost Egyptian foreign reserves enough to keep government departments running and help authorities end fuel shortages.
One expert from a Riyadh-based investment firm, John Sfakianakis, estimated that £8 billion could give Egypt a breathing space of four to six months.
The Egyptian prosecutor's office has ordered the arrest of Muslim Brotherhood leader Mohamed Badie on charges of inciting violence, state news agency MENA reported.
The office also ordered the arrest of other senior Brotherhood officials, including Badie's deputy Mahmoud Ezzat and party leaders Essam el-Erian and Mohamed el-Beltagi, it stated.
The charges relate to what Egypt's military described as an "assault" by supporters of ousted president Mohamed Morsi on the Republican Guard headquarters on Monday, which left 55 people dead.
The Muslim Brotherhood said its leaders have yet to be detained.
Spokesman Gehad el-Haddad said the charges were "nothing more than an attempt by the police state to dismantle the Rabaa protest," a vigil being held by its supporters at the Rabaa Adaweya square in northeastern Cairo.
Thousands of supporters of ousted Egyptian President Mohammed Morsi gathered overnight in Cairo, repeating their demands that he be returned to power.
The protests come as the interim president appointed a new prime minister. Economist Hazem el-Biblawi has said he will offer ministerial posts to members of the Muslim Brotherhood in the transitional government, state media reports.