Bloomberg News reports this is according to three unnamed “people familiar with the matter.” Clinton Foundation officials say they haven’t been notified of the attack and refuse to say more. The breach was discovered as recently as one week earlier.
The attack appears to be part of a larger sweep of attacks that has targeted at least 4,000 email accounts of people connected to US politics since about October 2015. Many of the targets appear to be linked to Clinton.
Bloomberg News comments, “The thefts set the stage for what could be a Washington remake of the public shaming that shook Sony in 2014, when thousands of inflammatory internal emails filled with gossip about world leaders and Hollywood stars were made public.”
Someone going by the nickname “Guccifer 2.0” has been releasing documents from a hack on the DNC [Democratic National Committee] but it is unknown if this person is linked to the foundation attack. (Bloomberg News, 6/21/2016)