The University of Maryland is offering four more years of credit monitoring for anyone affected by a computer security breach that compromised hundreds of thousands of personal records.

The school initially provided a free year of credit protection following the security attack in the early morning hours of Feb. 18. In a letter to the university community Tuesday, U-Md. President Wallace D. Loh said the offer has been extended to five years at no cost.

The school is asking victims of the security breach to call 1-866-274-3891 to register for Experian ProtectMyID Alert, a service that tracks identity theft and other misuse of personal information. Faculty, staff and students who have already signed up for a year of the credit protection will be automatically upgraded to five years, Loh said.

The security attack targeted a database with personal information dating back to 1998, exposing the names, Social Security numbers, dates of birth and university identification numbers for 309,079 people affiliated with U-Md. on its College Park and Shady Grove campuses.

Loh also announced he is giving a new task force 90 days to investigate the security breach and submit recommendations to him. Federal authorities, including the U.S. Secret Service, are already looking into the security attack.