Purdue University is warning more than 7,000 former students that their Social Security numbers may have been accessed last year during a computer breach.

Purdue said that a computer server containing old course records from 2000 through mid-2005 was broken into on April 5, 2010.

The Journal & Courier reports there's no evidence files were accessed. Instead, a review found the breach may have been part of an attempt to use the computer system to launch attacks against other servers.

Purdue sent letters Monday to 7,093 ex-students warning them that their Social Security numbers may have been accessed in the breach.

School spokesman Chris Sigurdson says it took Purdue until June to sort through the information on the server and identify which numbers corresponded to students.