The University of Virginia says its computer network is back online after being shut down for two days due to a cyberattack.

The university says the network was restored Sunday after a system security upgrade.

Administrators say no personally identifiable information was accessed and no sensitive research material was compromised.

The Daily Progress (http://bit.ly/1LgqcAm) reports the attack on the university's information technology systems targeted the email accounts of two employees.

U.Va. Chief Operating Officer Patrick D. Hogan says the university is adjusting its password change program to guard against further security breaches.

The university says federal authorities tipped the school of the breach, identifying the country of origin as China.

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Information from: The Daily Progress, http://www.dailyprogress.com