Citigroup Inc. says hackers accessed credit card data for some 200,000 US customers. The online security breach was first discovered in May, and reported yesterday by the Financial Times (which blocks access via an onerous paywall). "The bank said it recently discovered during routine monitoring that account information for about 1 percent of customers was viewed." AP, Reuters. As The Atlantic notes, the breach may be a lot worse than Citi's letting on. But even if the damage was limited to 200,000 users, that's a breach of 1% of all North American customer accounts (21 million). Washington Post item here.