The Department of Homeland Security is confirming "malicious Web activity" in a wide-ranging cyber attack on federal computer networks. According to reports, the attack began over the July 4 weekend, and some networks were still experiencing the effects on Tuesday evening. The Transportation Department, Secret Service and Federal Trade Commission were among the agencies affected. The so-called denial of service attack blocked access to federal Web sites for hours at a time, with the DOT site "100% down" for two days, according to one security company official.
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