Report: U.S. most prolific source of online attacks

U.S. networks pumped out the highest percentage of attacks during the second half of last year, with China running a distant second, according to a report released Monday by security firm Symantec.

The U.S. accounted for 31 percent of malicious activity originating from computer networks, while 10 percent came from China and 7 percent from Germany, Symantec said in its Internet Security Threat Report.

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