The phone and broadband provider, which has more than four million customers in the UK, added that other personal information may have sought by hackers. TalkTalk said it was “too early to say” how many of its four million UK customers had been affected by the attack. The company urged users to change their passwords and check their bank accounts.

The Metropolitan Police confirmed its Cyber Crime Unit was investigating an allegation of data theft which was reported on Wednesday – but no arrests had been made. A force spokeswoman said: “There have been no arrests and enquiries are ongoing.” The Talk Talk website was unavailable to customers tonight and displayed the message: “Sorry we are currently facing technical issues, our engineers are working hard to fix it. We apologise for any inconvenience this may cause.” FULL REPORT