Yahoo says hackers have been stealing personal information from it's users for the last two years.

The stolen data includes users’ names, email addresses, telephone numbers, birth dates, hashed passwords, and security questions — and answers — that verify an account holder’s identity.

The company says it just recently discovered the break-in as part of an internal investigation.

They recommend users change their passwords and, so far, there isn't any evidence that information about bank accounts, credit, or debit cards were swiped.