Turnout was 32.9% of Egypt's total of 52 million voters, election commission President Samir Abul Maati told a news conference in Cairo.
BBC: Egypt referendum: President Morsi backers urge unity
2.
Amer El-Maati, an Al Qaeda member and a licensed pilot is believed to have discussed hijacking a plane in Canada and flying it into a building into the United States.
Mr Maati rejected opposition allegations that fake judges supervised some of the polling - one of several complaints relating to voting fraud made by the opposition National Salvation Front after each stage of voting.
BBC: Egypt referendum: President Morsi backers urge unity