Citigroup hit by US cyber attack

THE e-mails and names of customers of Citigroup, Walgreen and other large US companies were exposed in a massive and growing data breach, after a computer hacker penetrated online marketer Epsilon.

In what could be one of the biggest such breaches in US history, diverse companies that did business with Epsilon stepped forward over the weekend to warn customers some of their electronic information could have been exposed. Affected firms included video recorder TiVo, credit card lender Capital One Financial and teleshopping company HSN.