Egypt's Supreme Constitutional Court, which dissolved parliament last month, is due to discuss how to respond to President Mohammed Mursi's order to reconvene it.

The speaker of the dissolved house has called for it to meet on Tuesday.

Army units surrounding the parliament building have withdrawn, allowing MPs to enter.

Mr Mursi, whose Muslim Brotherhood won most seats, says the chamber should function until a new election is held.

Military and judicial authorities have held emergency talks, but have not announced any action so far.

The Supreme Council of the Armed Forces (Scaf) - which has assumed legislative power - met in an emergency session shortly after the presidential decree was issued on Sunday.

It is due to hold another meeting.

Despite the apparent tensions, President Mursi and Field Marshal Hussein Tantawi, who heads Scaf, appeared together at a military cadet graduation ceremony on Monday.

The BBC's Jon Leyne, in Cairo, says that if there were a political truce in Egypt, it could soon be over - unless this is part of a more complicated deal, under which parliament would meet briefly then be dissolved by the president.