California High School Students Arrested for Allegedly Hacking School Networks to Change Grades

About 120 students' grades were changed at San Dimas High School in California.

— -- Two students at San Dimas High School in southern California were recently arrested for allegedly hacking into the school's website and changing grades for about 120 students, the principal said in a letter to parents today -- at least the second such incident in recent weeks.

The school is currently working with the Cyber Crimes Bureau of the Los Angeles Sheriff's Department to investigate "the unauthorized access," Principal Michael Kelly told ABC News in a statement. "We are very confident that we have the ability to restore all of the impacted scores. Teachers have been contacted and will be reviewing their student's grades for accuracy."

No further details were available about the alleged incident.

The Sheriff's department did not immediately respond to ABC News' request for comment.

The grade-changing incident comes just a few weeks after a senior from Dixon High School in northern California was also arrested for gaining access to his school's computer network, according to police.

The student, 18, was arrested on May 13 after school officials learned that over 200 grades of 32 students had been changed, a Dixon Police Department spokesperson told ABC News today.

He was charged with unauthorized access of a computer network operated by the government, a felony.

The status of the case was not clear. The Solano County District Attorney's Office did not immediately respond to ABC News' requests for information.

After further interviews with the 32 students whose grades were changed, nine students were suspended and one student was recommended for expulsion, the school district's superintendent, Brian Dolan, wrote on Facebook this past Wednesday.

There was not enough evidence to prove the other 23 students had been involved or had knowledge of their grades being changed, he added.