The US has called for the release of Mohamed Morsi as tens of thousands of supporters of the ousted Egyptian president staged protests across the country.
State Department spokeswoman Jen Psaki said the US agrees with the German Foreign Ministry, which had called for an "end to all restrictive measures considering Morsi".
Mr Morsi, an Islamist who became the country's first freely elected leader, was ousted on July 3 by the military.
His removal followed a wave of protests calling on him to step down.
He has been kept at an undisclosed Defence Ministry facility since then, but no formal charges have been filed.
Mohamed Morsi was ousted by the Army in what many called a coup Supporters vowed to continue their campaign of street rallies as long as necessary to force Mr Morsi's reinstitution.
At the main Islamist rally in Cairo, the crowd poured into a large boulevard in front of a main mosque where his supporters have been camped out for two weeks.
Some held up photos of Mr Morsi, others carried posters depicting army chief General Abdel Fattah al-Sissi with blood coming out of his mouth and emblazoned with the word "traitor".
"We are ready to stay for a month, two months, a year or even two years," an ultraconservative Salafi cleric, Safwat Hegazi, told protesters.
Friday prayers on the third day of Ramadan The day of protests marked the first Friday of the holy fasting month of Ramadan.
During Ramadan, Muslims abstain from food and drink from sunrise to sunset, which usually cuts down on activity during the day - particularly outdoors in warm summer temperatures.
During the daytime fast, some at the rally rested in their tents, reading the Quran or sleeping.
Similar rallies were held across the Nile River in Cairo's sister city Giza, in the Mediterranean city of Alexandria and several other cities.
Clashes have broken out between Mr Morsi's supporters and his critics A week of violence in a bitterly divided nation has left dozens of Mr Morsi's Islamist supporters dead.
The new military-backed administration has intensified its crackdown on the leadership of Mr Morsi's Muslim Brotherhood, issuing several arrest warrants.
The administration is pushing ahead quickly with its transition plans, which the military said would include new elections.
However, the new prime minister Hazem el Beblawi said members of the Muslim Brotherhood would be offered cabinet posts.
The French interior minister has called it a 'catastrophe'
Seven carriages piled up
Rescuers pull survivors from the wreckage. Pic: @aishakurdish
The train derailed at Bretigny-sur-Orge
Interim PM Hazem el Beblawi is trying to put together a cabinet
Violent clashes have erupted between Morsi supporters and opponents
Edward Burkhardt, chief executive of Rail World visited Lac-Megantic
Soldiers in gas masks on patrol in the Cairo suburb of Nasr City
Adli Mansour's decree comes after clashes between protesters and the army
Brotherhood leader Asem Abdel Maged delivers a speech to supporters
A man holds a bloodstained shirt following earlier clashes with the army
Supporters of Mohamed Morsi say their supporters were 'massacred'
The mangled remains of the train after the explosion in Lac-Megantic
The blast destroyed around 30 buildings in the small Canadian town
The train travelled downhill for nearly seven miles before derailing
Axle gear was strewn across the town of Lac-Megantic
At least five of the freight train's 73 wagons exploded
Barriers have been placed on rivers to contain the oil spill
The mangled interior of the Boeing 777. Pic: NTSB/Twitter
The plane's landing gear was separated from the fuselage. Pic: NTSB/Twitter
Investigators study the aircraft's tail fin. Pic: NTSB/Twitter 
Teenagers Wang Linjia and Ye Mengyuan died in the crash
Nigerian soldiers on patrol in a village
A poster offers a reward for the capture of Boko Haram head Abubakar Shekau
The debris of the aircraft's tail is seen on the runway after the crash
A plume of smoke rose from the plane after the crash landing
The wreckage is visible next to one of the runways at the airport