LOS ANGELES — A Department of Corrections official says former 1970s radical Sara Jane Olson was released from prison a year too early because of an “administrative error.”

Chief Deputy Secretary Scott Kernan said Saturday that criticism of Olson’s Monday release spurred a thorough review of her parole and a 2004 miscalculation was discovered that resulted in her release a year too early.

Kernan says Olson was taken back into custody Friday night at Los Angeles International Airport.

Olson, formerly known as Kathleen Soliah, spent six years in prison for trying to bomb Los Angeles police cars in the 1970s.