REPUBLIKA.CO.ID, CAIRO - An Islamist-backed Egyptian constitution won approval in a referendum, rival camps said on Sunday, after a vote the opposition said would sow deep social divisions in the Arab world's most populous nation.

The Islamist Muslim Brotherhood, which propelled President Mohamed Mursi to power in a June election, said an unofficial tally showed 64 percent of voters backed the charter after two rounds of voting that ended with a final ballot on Saturday.

An opposition official also told Reuters their unofficial count showed the result was a "yes" vote. while party spokesmen said there had been a series of abuses during the voting.

The main opposition coalition, the National Salvation Front, responded to the defeat by saying it was moving towards forming a single political party to challenge the Islamists who have dominated the ballot box since strongman Hosni Mubarak was overthrown two years ago.

Members of the opposition, taking heart from a low turnout of about 30 percent of voters, pledged to keep up pressure on Mursi through peaceful protests and other democratic means.

"The referendum is not the end of the road," said Khaled Dawoud, a spokesman for the National Salvation Front. "It is only the beginning of a long struggle for Egypt's future."

The referendum committee may not declare official results for the two rounds until Monday, after hearing appeals. If the outcome is confirmed, a parliamentary election will follow in about two months.

Mursi's Islamist backers say the constitution is vital for the transition to democracy, nearly two years after Mubarak was ousted in a popular uprising. It will provide the stability needed to help a fragile economy, they say.

The constitution was "a historic opportunity to unite all national powers on the basis of mutual respect and honest dialogue for the sake of stabilizing the nation," the Brotherhood said in a statement.

Rights groups reported what they said were illegalities in voting procedures. They said some polling stations opened late, that Islamists illegally campaigned at some polling places, and complained of irregularities in voter registration.

But the committee overseeing the two-stage vote said its investigations showed no major irregularities in voting on December 15, which covered about half of Egypt's 51 million voters. About 25 million were eligible to vote in the second round. The Brotherhood said turnout was about a third of voters.

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