(CNN) Parents who have pleaded not guilty in the college admissions scam, including Lori Loughlin and her husband Mossimo Giannulli, now face an additional bribery charge, federal prosecutors announced Tuesday.

Eleven parents -- Gamal Abdelaziz, Diane Blake, Todd Blake, Giannulli, Elisabeth Kimmell, Loughlin, William McGlashan Jr., Marci Palatella, John Wilson, Homayoun Zadeh, and Robert Zangrillo -- were charged in a superseding indictment with conspiracy to commit federal program bribery, prosecutors said.

Loughlin and these parents already faced charges of conspiracy fraud and conspiracy to commit money laundering. The charges are all part of the sprawling scheme to use their wealth to cheat, bribe and lie in an effort to game the college admissions system.

They now face a maximum of up to 45 years in prison for the charges.

The superseding indictment does not allege any new criminal behavior and is based on the same scheme prosecutors revealed in March.

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