"Carders" can put fraudulent info on swiped cards - a "very serious threat" to smartcard security - Visa won't say what if any action they will take
If you know you have a security problem, try do take action before you hear from the press. If the press contacts you before you take action, do not give them the run-around. The worst possible approach is to sit and wait to see if the story has has legs. That is the path to PR disaster.