*A cyber attack on US marketing firm Epsilon has resulted in millions of email addresses being stolen by hackers. The attack could impact customers of major banks, hotels and retailers.

Epsilon represents more than 2,500 brands, including Best Buy, TiVo, JP Morgan and Citgroup.

The company said it had experienced an attack that gave intruders unauthorized access to its email system.

The company has warned that thieves may use the information to launch a phishing campaign and trick them out of vital data, such as codes to log into bank accounts.

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