BBC reports:
The head of TalkTalk says she has had an email demanding a ransom from a group purporting to be behind the cyber-attack suffered by the company.
Chief executive Dido Harding said she did not know whether the ransom email was genuine.
The phone and broadband provider said personal and banking details of up to four million customers may have been accessed in the “significant” attack.
The Met Police said the email was “forming part of its investigations”.
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