MasterCard site goes down

The No. 3 credit card company said its corporate website crashed intermittently Tue. morning. MasterCard blamed a glitch at an unnamed Internet service provider, but hacking groups claimed credit for the outage. MasterCard's site was up again by midday and no customer data were affected, the company said. In Dec., the hacking group Anonymous was able to disrupt the sites of MasterCard (MA) and Visa (V), claiming they wanted to punish them for