By Jim Finkle and Mark Hosenball BOSTON/WASHINGTON (Reuters) – Target Corp and Neiman Marcus are not the only U.S. retailers whose networks were breached over the holiday shopping season late last year, according to sources familiar with attacks on other merchants that have yet to be publicly disclosed. Smaller breaches on at least three other well-known U.S. retailers took place and were conducted using similar techniques as the one on Target, according to the people familiar with the attacks. Only one well-known retailer, Neiman Marcus, has said that they too have been victim of a cyber attack since Target's December 19 disclosure that some 40 million payment card numbers had been stolen in a cyber attack. On Friday, Target said an investigation found that hackers stole the personal information of at least 70 million customers, including names, mailing addresses, telephone numbers and email addresses.
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