OAK RIDGE, Tenn. -- A highly sophisticated cyber attack -- known as Advanced Persistent Threat -- forced Oak Ridge National Laboratory to shut down all Internet access and email systems over the weekend.
Those restrictions will remain in place until lab officials and others investigating the attack are sure the situation is well controlled and manageable, Director Thom Mason said.
"We made the decision (at about midnight Friday) to close down the connection to the Internet to make sure there was no data ex-filtrated from the lab while we got the system cleaned up," he said.