"Reiss is still in jail but her trial has finished," the agency quoted Saeed Mortazavi as saying.
"For the moment any decision on her release on bail or staying in prison will be taken by the judge. If she is released on bail, she is still not authorised to leave the country until a verdict is passed."
Reiss, 24, was among those tried on charges related to huge protests across Iran after President Mahmoud Ahmadinejad was declared re-elected in June.
She was accused of spying and taking part in a Western plot to destabilise the government of the Islamic republic.
Iran has put on trial 110 protesters, including top reformists, Reiss, local French embassy employee Nazak Afshar and a local employee of the British embassy for allegedly participating in the unrest.
Afshar, a French-Iranian woman, was freed from prison on Tuesday.
