Washington, D.C. Hackers briefly overwhelmed at least three of the 13 computers that help manage global computer traffic Tuesday in one of the most significant attacks against the Internet since 2002.
Experts said the unusually powerful attacks lasted as long as 12 hours but passed largely unnoticed by most computer users, a testament to the resiliency of the Internet. Behind the scenes, computer scientists worldwide raced to cope with enormous volumes of data that threatened to saturate some of the Internet's most vital pipelines.
The Homeland Security Department confirmed it was monitoring what it called "anomalous" Internet traffic.
"There is no credible intelligence to suggest an imminent threat to the homeland or our computing systems at this time," the department said in a statement.
The motive for the attacks was unclear, said Duane Wessels, a researcher at the Cooperative Association for Internet Data Analysis at the San Diego Supercomputing Center. "Maybe to show off or just be disruptive; it doesn't seem to be extortion or anything like that," he said.