Protesters shouting anti-government slogans in Tahrir Square
The official result of Egypt's hotly disputed presidential election is due to be announced - a week after the polls closed.
Ahead of the declaration by the country's electoral commission at 3pm (2pm BST), thousands of supporters of the Muslim Brotherhood spent another night protesting in Cairo's Tahrir Square, warning against any attempt by the ruling military to "steal" the election, reports Sky News.
The initial count of the votes suggested a clear win for the Islamist movement's Mohamed Morsi.
But his rival, Ahmed Shafiq - ousted President Hosni Mubarak's former Prime Minister - also claimed victory.
The result was delayed, supposedly to allow the investigation of allegations of fraud.
Adding to the tension, Egypt's generals this week issued a decree, granting themselves the powers that had been assigned to the parliament - effectively limiting the role of the new president.
The move followed a court ruling, ordering the dissolution of the Islamist dominated legislature over irregularities during the parliamentary elections earlier this year.
On Friday, the military said the decree was necessary because Egypt was going through a "critical" period.
Behind the scenes, the military leaders and the Muslim Brotherhood have reportedly held days of talks to try to reach a compromise.
The generals are said to have urged the Islamist movement to accept what would effectively be a power sharing deal with the military.
Analysts have suggested that the presidency will be awarded to Ahmed Shafiq if the Muslim Brotherhood does not agree.
But the Islamist movement has also demonstrated its strength over the past week by calling thousands of its supporters out onto the streets.
The protests seem designed to send a warning of mass unrest if Mohamed Morsi is not declared the winner.
The military says it will deal with any attempt to harm the public interest with a "firm hand".
Many Egyptians are dismayed that what was billed as their first democratic presidential election has turned into a power struggle between the military and the Muslim Brotherhood - the same forces that faced off under the old regime.
Moderate, secular Egyptians are alarmed at the prospect of Islamist rule, but many also fear a return to the repression of the Hosni Mubarak era which last year's revolution was meant to have brought to an end.