Tahrir Square protesters say they plan to march Friday to the presidential palace in Heliopolis unless the army makes its stance clear.
Youth-led groups issued a statement calling for all Egyptians to march on the palace, the People's Assembly and the television building, in what they are calling the "Friday of Departure."
They say the army must choose which side they are on: That of the people, or the regime.
Al Jazeera reports that six of its reporters have been arrested in Cairo.
The Egyptian government on Sunday forced Al Jazeera's Cairo offices to close and suspended its correspondents' accreditations.
The reporters, who were arrested from their hotel rooms, believe they were arrested on the pretext of reporting without permission.
Dan Nolan, one of the reporters arrested, tweeted that he was being held at an army checkpoint outside the Hilton hotel in Cairo.
250,000 protesters in Tahrir Square today, including thousands from trade unions.
Egyptian actor Omar Sharif calls on Mubarak to step down.
Egypt stopped all its rail services today. Speculation is that part of the reason is to stop escaping prisoners from getting too far....or perhaps to limit the number of people who can attend the major demonstrations.