Hours after Microsoft revealed hacking groups affiliated with the Chinese government have been exploiting a flaw in its SharePoint software, Bloomberg News reports that the National Nuclear Security Administration has also been breached in the attacks.

The US government agency in charge of designing and maintaining nuclear weapons was among those breached by a hack of Microsoft's SharePoint server software.

Microsoft SharePoint zero-day flaws were exploited to breach over 50 organizations, including the National Nuclear Security Administration.