The Saudi hacker who earlier this week exposed the details of an estimated 15,000 Israeli credit cards yesterday posted 11,000 additional card numbers and threatened to release the details of one million stolen credit card numbers in all. In a message posted by “0xOmar” from the Saudi hacking group Group-XP, the hacker claimed he had “hacked much more than you can imagine.” Israeli credit card companies said yesterday they have the new list of hacked numbers and are working to assess the situation. Company employees are briefing affected customers and canceling their cards. Company officials said only a few dozen new cards were in the latest list of numbers, and that they were canceled before any transactions were made. According to Shai Blitzblau of Maglan Information Defense Technologies, initial checks by company experts indicated that the new file contains only a few hundred new credit card numbers, along with around 4,000 credit card numbers that were exposed in the past year.