Customers of British telecom giant TalkTalk are being targeted by an India-based industrial-scale fraud network, three whistleblowers have revealed to the BBC. 

The three whistleblowers said they were working in call centers run by two front-companies instituted by a gang of professional fraudsters. 

The gang runs three call centers across two Indian cities. Each office has around 60 employees who work in shifts.

TalkTalk was hit by a cyber-attack in October 2015, but that hack appears to be unrelated to the Indian fraud.

A TalkTalk spokesman said: “We are aware that there are criminals targeting a number of the UK and international companies, and we take our responsibility to protect our customers very seriously."

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