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ATLANTA --Atlanta Public Schools Interim Superintendent Errol Davis says an investigation ofpossible grade changingat North Atlanta High School is completely unrelated to the removal of interim principal Mark Mygrant and four other school administrators earlier in October, APS spokesman Stephen Alford told 11Alive Kids and Schools reporter Donna Lowry Friday.

A source close to the situation told Lowry the investigation is tied to accusations of changing of grades, not test scores, but it is not clear as to how wide-spread this may be within the school. There is no indication, the source said, as to whether this involves one or more than one instance of grade changing.

Alford told 11Alive News Thursday that the investigation is being conducted by the APS Office of internal compliance, and could cover a "wide range of issues," possibly including students, teachers or principals. Alford did not indicate when the investigation began or when it might conclude.

North Atlanta High parent Julie Salisbury described her response to the investigation as a "mixed bag of feelings."

"It came as a shock," she said. "My first reaction was 'Oh, no, not one more thing'."

But, she stressed, she is grateful "that we currently have an administration that takes even allegations of impropriety seriously, as opposed to ignoring them."

North Atlanta High School was at the center of controversy earlier in the month when Davis abruptly removed Mygrant and the other administrators. Mygrant had already submitted his retirement and was serving as acting principal until Oct. 29, when the school's new principal, Dr. Gene Taylor, was slated to assume his new position as principal at North Atlanta.

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Students, upset with the abrupt changes, walked out of class in protest on Oct. 10, a day after Superintendent Erroll Davis addressed parents and teachers about the changes. Davis said he made the decision to improve sub-par school performance.