Updated 3:38 pm ET, Monday, November 21
AT&T, the nation's second largest wireless phone company, on Monday sent an email to selected customers warning them of an "organized and systematic" hacking attempt on their accounts, Bloomberg Businessweek reported.
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"We recently detected an organized and systematic attempt to obtain information on a number of AT&T customer accounts, including yours," the email read. "We do not believe that the perpetrators of this attack obtained access to your online account or any of the information contained in that account."