CAIRO - Egypt's opposition plans new protests on Tuesday against a planned Islamist-backed constitution that looks set to be approved in the second round of a referendum next weekend.

Islamist President Mohamed Morsi obtained a 57 percent "yes" vote for the constitution in initial voting on Saturday, his party said, less than he had hoped for.

The result is likely to embolden the opposition, which says the law is too Islamist, although the second round is expected to result in another "yes", while underlining the deep divisions that have riven Egypt since Hosni Mubarak's fall.

On Monday, protesters broke out into cheers when the public prosecutor Morsi appointed just last month announced his resignation. They said it was a victory for the independence of the judiciary.

But they are unlikely to win Saturday's referendum second round, to be held in districts seen as even more sympathetic towards Morsi's Muslim Brotherhood, which won elections held after Mubarak was ousted in February 2011.

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