American Express is informing cardholders that their payment card data may have been exposed after a third-party service provider suffered a security breach. The information obtained by unauthorized parties includes account numbers, names, and expiration dates. The name of the affected service provider has not been made public. American Express recommends cardholders enabling instant notifications of a potentially fraudulent activity, the company offers it by enabling notifications in the American Express Mobile app, or signing up for email or text messaging at americanexpress.com/accountalerts.”]
Source: http://securityaffairs.co/wordpress/45387/cyber-crime/american-express-data-breach-notice.html