CORVALLIS, Ore. (AP) -- Oregon State officials say credit card scammers may have defrauded 4,700 online customers of the school's bookstore.

Phone calls and e-mails started flooding into the bookstore from customers who noticed suspicious charges on their credit cards immediately after they'd placed online orders.

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Bookstore General Manager Steve Eckrich says servers were shut down when the security breach was discovered.

State Police Lieutenant Jeff Lanz says the security breach appears to have originated outside the university, but where is unknown.