Los Angeles ? Just days after her release on parole, a former 1970s radical was headed back to prison Saturday to serve at least one more year after corrections officials said a miscalculation resulted in her early release.

Criticism over the early release from prison Monday of Sara Jane Olson, who lived as a fugitive for years in Minnesota, spurred a review of her sentence and the timing of her parole, Scott Kernan, the chief deputy secretary for the California Department of Corrections, said at a news conference. The review revealed that a 2004 miscalculation led to the former Symbionese Liberation Army member being released a year too early, he said.

He said the review was ordered “after many concerns raised in the media.” The union that represents Los Angeles police officers and the son of a woman killed in a decades-old botched robbery at a bank near Sacramento opposed Olson’s release.