The U.K.'s data watchdog is investigating the hack of Carphone Warehouse in which data of 2.4 million customers may have been accessed, with security experts warning that criminals could use the information for further fraudulent activities.
The Information Commissioners Office (ICO) confirmed it has been made aware of the cyber breach and said it is "making enquiries".
Scant details have been given of the attack but Carphone Warehouse said that the systems of one of it divisions in the U.K. were breached by a "sophisticated cyberattack". The unit operates OneStopPhoneShop.com, e2save.com and Mobiles.co.uk and provides a number of services to iD Mobile, TalkTalk Mobile, Talk Mobile, and to certain customers of Carphone Warehouse.
The ICO has the power to fine a company up to £500,000 ($773,455) if it is found to be negligent in the handling of customer data.
The attack was found by Carphone Warehouse on Wednesday but only made public on Saturday, sparking outrage