Russian hackers were behind an intrusion in recent months into a nonclassified White House computer network, CNN reported.
Deputy White House National Security Adviser Ben Rhodes said on CNN that no classified information had been compromised, while declining to link any attacks to Russia.
"We do not believe our classified systems were compromised," Rhodes said Tuesday. He said the White House is "constantly updating" its unclassified system and that personnel are told to act as if information on that network could be compromised by hackers.