WASHINGTON — The top U.S intelligence official says the U.S. still has not figured out who was behind the July 4 cyberattacks that took down a series of government Web sites.
Dennis Blair, the national intelligence director, says the attackers covered their tracks by temporarily hijacking a network of computers, which were used to spawn the cyber offensive. The U.S. is working with other countries to identify the perpetrators.
The South Korean government says it has evidence of North Korean involvement but has not yet assigned blame.
The attacks, in which hundreds of computers tried to connect to a single Web site at the same time to overwhelm the server, caused outages on prominent government-run sites in both the United States and South Korea.
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