Russian hackers who breached computer systems at the White House got as far as president Obama's emails, according to reports.
The hack on the White house took place last year, but details continue to emerge and the most recent information suggests that the extent of plundered data and exposed information is far worse than before.
A report in The New York Times said that some of Obama's BlackBerry emails containing "closely guarded secrets" were intercepted and shared by hackers.
The emails were not taken straight from Obama's phone, but from the computers of other people in the White House.
The NYT said that the paper had spoken to officials involved in the investigation who claim that emails sent and received by Obama were exposed.
The officials did not disclose the amount of exposed email, and declined to comment on its content. However, they did say that no classified networks were compromised, and that nothing sensitive was lost.
This does not lessen the impact of the attack, according to the officials, who said that it was "one of the most sophisticated" that they have seen. The White House declined to comment officially.
Information about the 2014 hack has emerged in stages, each revealing more about the incident.
Initial reports suggested that nothing sensitive was taken, but it was revealed later that information about the president's appointments and arrangements might have been taken.
The official line is that no real harm has been done and that the government systems are as secure as they can be.
"We're constantly updating our security measures on our unclassified system, but we're frankly told to act as if we need not put information that's sensitive on that system," said Ben Rhodes, president Obama's deputy national security adviser, earlier this month.
"In other words, if you're going to do something classified, you have to do it on one email system, one phone system. Frankly, you have to act as if information could be compromised if it's not on the classified system."
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