Chipotle warns of possible data breach affecting payment system

NEW YORK — Chipotle saw a key sales figure rise more than expected as it works to regain customers' trust after a series of food scares, but may have lost at least a little ground again in disclosing a possible data security issue.The company said it recently detected unauthorized activity on the network that supports its payment system in restaurants, but believes it has stopped the activity. It said its investigation is focused on restaurant transactions between March 24 and April 18 of