The Bush-Cheney reelection campaign has barred people outside the United States from viewing its Web site following an electronic attack that took down the campaign's Internet address for six hours last week, according to computer security experts.
The move happened one week after the Bush-Cheney and Republican National Committee sites were unavailable for almost six hours. Security experts said the outage probably was the result of a "distributed denial-of-service attack," in which hackers use tens of thousands of hijacked computers to overwhelm Web sites by flooding them with bursts of digital data.