Education Week reports that the research and testing organization the American Institutes for Research (AIR) has acknowledged that 6,500 current and former employees' personal information may have been compromised when one of its servers was hacked earlier this month (h/t SC Magazine).

"On Monday, May 12, 2014, we determined that unencrypted (plain text) personal information on current and former AIR employees may have been accessed through a hacking incident," AIR president and CEO David Myers wrote in a notification letter to affected employees dated May 14, 2014. "At this point, we have no evidence that any information was accessed or misused."

The information accessed includes employees' Social Security numbers and credit card information, though AIR says no student information was accessed.

"The breach only affected our business systems," AIR director of public affairs Larry McQuillan told Education Week. "By design, student data resides on an external information system independent from the domain that was affected."

Al those affected are being offered free access to credit monitoring services.

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