Egyptians were waiting on Monday for the official results of a referendum on an Islamist-backed draft constitution, which preliminary results showed the majority of voters approving.
No official date was set for the results. However, local media said the announcement was expected on Tuesday.
The Muslim Brotherhood backing President Mohamed Morsi and state media say an unofficial tally shows 64 per cent of ballots backed the constitution.
Egypt's main opposition alliance, The National Salvation Front, claimed numerous instances of "fraud and violations" during the vote.
Approval of the proposed charter would clear the way for elections of the lower house of parliament to take place within 60 days. The Islamist-dominated, advisory Shura Council, or upper house, will be given the authority to legislate until a new legislature is elected.
Morsi called on the Shura Council to convene for a new parliamentary session on Wednesday, following the appointment of 90 members to fill one third of the 270-member body.