The Nashua School District said classes will go on as scheduled Monday after it was hit by a "sophisticated" cyberattack Sunday.
The district said it is working with a third-party investigator to determine the nature and scope of the attack.
"We are working diligently to investigate the incident, confirm its impact on our systems, and securely restore functionality to our environment as soon as possible," the district said in a statement.
Because the scope of the attack is not known, CEO of Cyber Defense Media Group Gary Miliefsky said parents, students and staff should be aware that any of their data or information could have been compromised.
"We've been told it's a sophisticated attack. Well, that could be anything," Miliefsky said. "We need to know what happened, how it happened, and what records or personally identifiable information were lost or stolen and to whom."
Nashua School District Board of Education Member Paula Johnson said she's never heard of anything like this happening in the district.
"I think it's a horrible thing that's happening in our world today. We were told when we went paperless that the internet was going to be the greatest thing, I guess, since peanut butter. But obviously, it's not. Because not only are the cyberattacks happening in the medical field, and in the federal government, that's happening now in our school districts all around the country probably," Johnson said. "And it's really sad that this has happened. And maybe we should go back to paper and just having that paper trail be a lot safer. All you have to do is shred it when you're done with it."