Though the Internet sustained little damage from terrorist attacks that crippled lower Manhattan's communications networks, researchers warn ISPs to be prepared.
Moments after airplanes separately crashed into both towers of the World Trade Centre, and then later the Pentagon, Web sites for the major news outlets were swamped by an overflow of traffic.
The US wants to help defend against cyber attacks by embarking on a project that would build the equivalent of an online nuclear bomb.
Terrorist attacks that turned the World Trade Center and New York City into a disaster zone Tuesday severely taxed the nation's communications networks, preventing many people from making phone calls and accessing some news Web sites.
The US Defense Department is worried that sensitive information remains exposed on its Web sites.
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