CAIRO — An overwhelming majority of Egyptians who voted on the country’s new constitution have backed it, a senior Egyptian official said today.

The election official said that unofficial results, after most of ballots have been counted, indicate that more than 90 percent of the voters have said “yes” to the constitution.

He declined to give an estimate on the final turnout.

Meanwhile, Nabil Salib, the head of the Supreme Election Committee, said ballots are still being counted and that final results would be announced in a few days. He initially said the results were expected Friday.

The vote held Tuesday and Wednesday is a milestone for Egypt’s interim government, installed by the military after the ouster last July of Islamist President Mohammed Morsi, following mass protests demanding that he step down.