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A high-tech hack has resulted in grades being altered at Seattle area high schools, according to a report by KIRO 7. Seattle Public Schools issued a memo today indicating that network log-in credentials have been stolen and “used to inappropriately access district systems.”

The hack has been going on for several weeks, and possibly longer, according to the memo.

KIRO 7 reports that the hackers used key logging devices — plugged into USB ports — to capture keystrokes. The Seattle Times reports that teachers have been asked to monitor possible grade changes, and keep an eye out for suspicious devices plugged into computers.

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