NEW YORK - The not-for-profit network formed by American Express Co. to help combat online fraud has officially launched it Web site, merchantfraudsquad.com.

Officials of the Worldwide E-Commerce Fraud Prevention Network, which American Express will fund for its first year, said the site should help merchants of any size. Its content includes instructions for reporting hacking incidents, a quiz to gauge a Web site's security, and technology and privacy tips.

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