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Last week, several users began receiving messages from "Visa International Service" that appeared to direct them to www.visa.com, the company's official site. However, when users clicked on the link, they were sent to a site that looked like Visa's but did not belong to the company. E-mail security company Tumbleweed Communications, which runs an the Anti-Phishing Working Group, noted that the number of such attacks rose 400 percent this holiday season. Even worse, more and more phishing attacks are expected to take place.