A cyber attack has limited parental access to Oklahoma City Public Schools' student information system for nearly a week, but no student data has been stolen, a district spokeswoman said Sunday.

In a statement, spokeswoman Beth Harrison said the "denial of service" attack on Infinite Campus, which houses the district's parent portal, has made it difficult if not impossible to access the site.

"To be clear, this is NOT a data breach and Infinite Campus HAS NOT been hacked; attacks like these simply limit their customers' ability to reach their web-hosted applications," Harrison's statement said. "No student data has been stolen/breached. "

Infinite Campus is one of the largest student information systems in America and their data centers are "frequently under attack from a variety of sources," Harrison said.