July 22 (Reuters) - U.S. National Nuclear Security

Administration was among those breached by a hack of Microsoft's ( MSFT )

SharePoint document management software, Bloomberg News

reported on Tuesday, citing a person with knowledge of the

matter.

Bloomberg reported that no sensitive or classified

information is known to have been compromised in the attack on

the National Nuclear Security Administration, the agency

responsible for maintaining and designing the nation's cache of

nuclear weapons.

Reuters could not immediately verify the report.

The U.S. Energy Department, U.S. Cybersecurity and

Infrastructure Security Agency, and Microsoft ( MSFT ) did not

immediately respond to request for comments from Reuters.