By Mariano Castillo, CNN
(CNN) - Federal investigators have cleared controversial Arizona sheriff Joe Arpaio's office of criminal wrongdoing regarding allegations of financial improprieties.
The U.S. Attorney's Office in Arizona declined to file charges against the Maricopa County Sheriff's office after an investigation into claims of abuse of county credit cards, misuse of funds and other financial matters.
The investigation is separate from a federal civil rights lawsuit accusing Arpaio's office of racial profiling.
The federal financial probe stems from a 2010 request from Maricopa County officials for help in investigating the claims of misuse of county funds. Federal authorities acted as "special deputy county attorneys" tasked with finding possible state charges.
Last year, federal investigators declined to press charges on several of the allegations. In a letter to the Maricopa County officials Friday, the U.S. Attorney's Office announced it will not initiate charges on two remaining claims.