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Visa, MasterCard, and Discovery sent out a warning to a number of American banks cautioning them about a "massive" security breach at one of their American credit-card processors on March 30, 2012. The alert sent out by Visa and MasterCard to banks stated that a number of cards had been compromised. The breach occurred between January 21 and February 25, 2012 and was estimated to have involved as many as 10 million credit cards. The credit card companies blamed a third party for the breach of customers' details. Security blog KrebsOnSecurity first reported the story and suggested that the details had been made available in New York. The Wall Street Journal suggested that card-processing firm Global Payments was the company that had suffered the breach.

In a public statement Visa said - "Visa Inc. is aware of a potential data compromise incident at a third party entity affecting card account information from all major card brands. There has been no breach of Visa systems, including its core processing network VisaNet. Visa has provided payment card issuers with the affected account numbers so they can take steps to protect consumers through independent fraud monitoring and, if needed, reissuing cards."
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