The Liberal Democrats, home affairs spokesman, Nick Clegg has warned that organised crime will try and crack the identity cards database - the National Identity Register (NIR).
Last year it was revealed that the identities of 13,000 civil servants had been stolen and used by criminals to make fake tax credit claims.
In a statement, Clegg commented that the theft was a "terrible omen" for the forthcoming ID cards scheme and added: "If organised criminals are capable of infiltrating the Department for Work and Pensions (DWP), "it is clear they will target the identity cards database where the stakes are even higher".
He concluded: "The government's claims that ID cards will cut identity fraud look increasingly unrealistic. If the ID cards database is breached, people could find their iris scans and fingerprints - as well as personal data and national insurance numbers - stolen."