( CNN ) -- A former member of the radical 1970s group Symbionese Liberation Army is back in custody after a clerical error miscalculated her prison release date , a California Department of Corrections spokesman said Saturday . Sara Jane Olson wipes away a tear at a Los Angeles courthouse in 1999 . Sara Jane Olson was freed Monday . But her earliest release date is now March 17 , 2009 , Chief Deputy Secretary Scott Kernan said , calling the error `` an aberration . '' `` Our department immediately rearrested her , and she will serve her full sentence , '' Kernan said . He described Olson as cooperative and said the arrest took place `` without incident . '' She will serve the year at the Central California Women 's Facility in Chowchilla , California . `` The department is sensitive to the impact such an error has had on all involved in this case and sincerely regrets the mistake , '' Kernan said . Watch explanation for mistaken release » . An investigation is under way to find out how the error happened , he added . Olson had served about six years behind bars for her role in incidents in 1975 : the attempted bombing of two police cars and the shooting death of a customer during a bank robbery . Prosecutors said she was part of an SLA plot to murder Los Angeles police officers by planting bombs under their squad cars . One of the cars was parked outside a crowded Hollywood restaurant . The bombs did not go off , and no one was hurt . The SLA is best known for its 1974 kidnapping of newspaper heiress Patty Hearst . A parole board hearing in 2004 reduced the sentence related to the attempted bombing charge , but `` an administrative error failed to take into account '' the second-degree murder charge for the shooting death , Kernan said . David Nickerson , one of Olson 's attorneys , said he and co-counsel Shawn Chapman Holley intend to file a petition with Los Angeles Superior Court on Monday . Olson can not be treated as `` yo-yo '' in regard to the law , he said . Chapman Holley called her return to custody `` ridiculous . '' `` It 's like they make up all new rules when it comes to her , '' Chapman Holley told The Associated Press . `` It 's like we are in some kind of fascist state . '' The administrative error was verified late Saturday morning , Kernan said , after a thorough review of Olson 's case . He said `` concerns '' about her release date prompted the review . Olson was taken into custody at Los Angeles International Airport on Friday night , Kernan said . Olson had been granted interstate parole and was on her way to Minnesota , where she lived for more than two decades as a fugitive before she was arrested in 1999 , Nickerson had said . From the Los Angeles airport , authorities took Olson to her home in Palmdale , California , where she remained until she was arrested midday Saturday , when the review was completed , Kernan said . Originally named Kathleen Soliah , Olson fled California after authorities began looking for her and then changed her name and lived for more than two decades as a fugitive before she was arrested in 1999 in Minnesota . She had married and was raising three daughters . Many residents rallied to Olson 's cause and helped post bail for her . But one group in California , the Los Angeles Police Protective League , denounced her release . `` She needs to serve her full time in prison for these crimes and does not deserve time off for working in prison , '' the group said . `` After participating in one killing and attempting two more , she managed to elude authorities and live a guilt-free middle class life for decades . Criminals who attempt to murder police officers should not be able to escape justice simply because they have good lawyers . '' E-mail to a friend . CNN 's Irving Last contributed to this report .
NEW : Sara Jane Olson 's attorney says she can not be treated as `` yo-yo '' Ex-Symbionese Liberation Army member freed Monday after serving about six years . California Department of Corrections says clerical error led to release . Her earliest release date is now March 17 , 2009 .