The White House says no official U.S. government email accounts were accessed during what Google alleges was Chinese hacking of its email systems.
Obama spokesman Jay Carney says the FBI is investigating Google's allegations, but had no comment on whether China was involved. Google says personal Gmail accounts of several hundred people, including senior U.S. government officials, military personnel and political activists, were exposed.
Carney says the administration doesn't restrict government employees from personal use of Gmail accounts, but directs workers to use government email for official business.
Carney says threats to information and communication pose serious economic and national security challenges to the U.S.