(CNN) -- The University of Southern California is warning students and faculty about a credit card security breach following the hacking of a software system on the campus.
In an e-mail statement Thursday, campus officials detailed the breach that occurred at dining facilities between May 21 and June 21.
"Credit card numbers were obtained illegally through a breach in a third-party software system used to process credit card transactions in some USC dining halls," the statement said.
No other personal information was stolen, according to the statement.
Students, visitors and faculty were asked to check credit card statements for unusual charges in the next few months. It was unclear how many people were affected.
An investigation involving the Los Angeles Police Department is under way