SEOUL, July 12 (UPI) -- South Korea's National Intelligence Service says it can't prove a rash of cyberattacks came from North Korea, but circumstantial evidence points to Pyongyang.
The spy agency released a statement Saturday saying it has drawn no concrete conclusions about the computer attacks, in which so-called "distributed denial-of-service" attacks were aimed at 36 key government and business Web sites for three days last week, the South Korean news agency Yonhap reported.
"A thorough investigation is under way to find out concrete evidence that the North is responsible for the attacks," the NIS said in a statement.
Yonhap previously reported NIS officials had told Seoul's ruling Grand National Party they had obtained a North Korean document in which members of a secret computer hacking team called "Number 100" were ordered to "destroy" the South's communication networks.
Park Young-sun, a lawmaker from the main opposition Democratic Party, told reporters intelligence officials had pointed a finger at Pyongyang during a closed-door meeting but didn't provide much evidence.
