The White House has confirmed it was the target of a cyber-attack but said it thwarted the effort and that no classified networks were threatened. White House spokesman told reporters the White House is equipped with mitigation measures that identified the attack, isolated it and prevented its spread. He said there was no indication that any data was removed. "There are distinctions between those networks that contain classified information and those that don’t, and the attack was against an unclassified network," spokesman said. Last year, Google Inc. blamed computer hackers in China for a phishing effort against Gmail accounts of several hundred people. The White House would not say whether the recent attack was linked to China.