2012-09-27yahoo.com

Bank of America, JPMorgan Chase, Citigroup, U.S. Bancorp and PNC have been hit by a wave of cyberattacks that have caused Internet blackouts and delays on online banking sites.

The banks have been targeted with distributed denial of service or DDoS attacks, in which hackers barrage a Web site with traffic, causing it to slow or collapse under the load.



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