Egyptians have voted narrowly in favour of a constitution shaped by Islamists but opposed by other groups who fear it will deepen divisions, officials said after the first round of a two-stage referendum.
Next week's second round is likely to give another "yes" vote as it includes districts seen as more sympathetic towards Islamists, meaning the constitution would be approved. But a close win would give President Mohamed Mursi limited cause for celebration as it would demonstrate a wide rift in a country where he needs to build consensus on tough measures to fix a fragile economy.
The Muslim Brotherhood's party, which propelled Mr Mursi to office in a June election, said 56.5% backed the text. Official results are not expected until after the next round.
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Mr Mursi and his backers say the constitution is vital to move Egypt's democratic transition forward. Opponents say the basic law is too Islamist and tramples on minority rights.
The build-up to Saturday's vote was marred by deadly protests after Mr Mursi awarded himself extra powers and then fast-tracked the constitution through an assembly dominated by his Islamist allies. However, the vote passed off calmly.