A hot line for information about 3.5 million Texans who had their Social Security numbers and other personal information exposed to the public remains overwhelmed with calls four days after the security breach was announced.

Texas comptroller's office spokesman R.J. DeSilva says the hot line received 33,500 calls in its first two days. DeSilva said at least 50 operators are taking calls 24 hours a day, and up to 115 are on duty during peak hours.

The FBI and state authorities are investigating after personal data was left for nearly a year or longer on a comptroller server accessible to the public. Personnel involved were fired.