A Minnesota company that guarantees federal student loans says someone stole personal data on about 3.3 million people from its St. Paul headquarters.

Educational Credit Management Corp. said Friday the data includes names, addresses, dates of birth and social security numbers, but no bank account or other financial account information.

ECMC says the theft of portable storage media containing the data happened sometime last weekend. The company discovered the theft last Sunday and contacted law enforcement.

ECMC has arranged with credit protection agency Experian to provide the affected borrowers with free credit monitoring and protection services. They’ll also be provided with identity theft insurance coverage.