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Clotilde Reiss Image Credit: AFP

Teheran: The lawyer for a French teaching assistant who was arrested on spying charges after Iran's disputed June election said on Saturday she would be acquitted by Sunday.

"The case of Clotilde Reiss is finished. The court will acquit my client of charges by Sunday," Mohammad Ali Mahdavi-Sabet told Reuters.

Reiss, who has been out of jail on bail and staying at the French embassy, was accused of taking part in a Western plot to destabilise the Iranian government after the June 12 vote in which President Mahmoud Ahmadinejad was re-elected.

Her case has raised tensions between France and Iran, already at odds over Tehran's nuclear programme. France says Reiss is innocent and has demanded her immediate release.

She was arrested in Tehran in July when preparing to leave the Islamic state after a five-month stint working at the University of Isfahan.

She was among thousands of people detained over widespread post-election unrest. Most of them have been freed.

Defeated moderate candidates say the election was rigged to secure Ahmadinejad's re-election. The authorities deny this.