A security breach at credit card payment processing company Global Payments, Inc., which processes payments for Visa and MasterCard, may have compromised more than 10,000,000 card numbers.
Global Payments has confirmed that the breach was discovered in early March.
Visa and MasterCard have been warning banks about the breach, providing lists of specific cards that may have been compromised, and banks are currently combing transaction data to look for common points of purchase for the compromised cards.
Security reporter Brian Krebs, who broke the story, says that the many of the cards were used in parking garages in and around New York City. Two law enforcement sources also told Krebs that the breach may be connected to Dominican street gangs based in NYC.
Both major credit card companies have issued statements saying that their core networks haven't been compromised.
Meanwhile, Global Payments stock has been suspended for trading after dropping 9% on the Nasdaq on news of the breach.