A computer hacker has gained access to more than 5 million Visa and Mastercard credit card accounts in the US. The two companies say that none of the information obtained, which would include credit card numbers, was used in a fraudulent way. Visa and Mastercard said the hacker breached the security system of a company that processes credit card transactions on behalf of merchants. http://news.bbc.co.uk/1/hi/business/2774477.stm