U.S. National Nuclear Security Administration was among those breached by a hack of Microsoft's SharePoint document management software, Bloomberg News reported on Tuesday, citing a person with knowledge of the matter.

The US agency responsible for maintaining and designing the nation’s cache of nuclear weapons was among those breached by a hack of Microsoft Corp.’s SharePoint document management software, according to a person with knowledge of the matter.

The US agency overseeing nuclear weapons breached in a China-linked hack of Microsoft SharePoint, according to Bloomberg. Officials say no classified data was exposed and the impact was limited.