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eFinancialNews writes:
NYSE Euronext and Nasdaq OMX Group said their public websites were targets of "cyber attacks," though market operations were unaffected.

NYSE Euronext learned of the incident from authorities who detected a "denial of sevice" attack on nyse.com, though officials declined to identify which agency brought it to their attention, or how long it had been happening
If a tree falls in the forest and no one is around to hear it, does it make a sound?