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Officials say the Salt Lake City School District's computer servers were hit by a cyberattack, but no confidential information was taken.
District officials say the attack began Friday afternoon and lasted through Monday morning, interfering with the website, phone systems and grading programs.
District spokesman Jason Olsen says thousands of computers were sending data to the schools' network at the same time, overwhelming it in the same way that too many cars would overwhelm a highway.
The attack meant parents and other people had difficulty reaching Internet-based school phones Monday morning. The grading system, which is in heavy demand at the end of the term, was also affected.
Olsen says he is not sure why the district was targeted and that officials will review the incident with network security experts.