T-Mobile confirms it was hit by data breach

T-Mobile confirmed on Monday that it has been hit by a data breach but declined to say whether any personal information from customers was accessed or how widespread the damage may be.

The company's acknowledgement of a breach comes after hackers told Vice that they were selling "full customer info" obtained from T-Mobile servers that pertained to what the hackers claimed were over 100 million people. Late Sunday, the company said it was "aware of claims made in an underground forum" and "actively investigating their validity." On Monday, the company said it has closed a vulnerability used by hackers to gain entry to T-Mobile's systems, and is working with the "highest degree of urgency" to investigate the breach.