Police are investigating a “significant and sustained cyber-attack” on the TalkTalk website, the UK company says.
The phone and broadband provider, which has over four million UK customers, said banking details and personal information could have been accessed.
TalkTalk said potentially all customers could be affected but it was too early to know what data had been stolen.
The Metropolitan Police said no-one had been arrested over Wednesday’s attack but enquiries were ongoing.
TalkTalk said in a statement that a criminal investigation had been launched on Thursday.
It said there was a chance that some of the following customer data, not all of which was encrypted, had been accessed:
- Names and addresses
- Dates of birth
- Email addresses
- Telephone numbers
- TalkTalk account information
- Credit card and bank details
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