Washington (CNN) For the first time, US investigators say they have corroborated some of the communications detailed in a 35-page dossier compiled by a former British intelligence agent, multiple current and former US law enforcement and intelligence officials tell CNN. As CNN first reported, then-President-elect Donald Trump and President Barack Obama were briefed on the existence of the dossier prior to Trump's inauguration.

None of the newly learned information relates to the salacious allegations in the dossier. Rather it relates to conversations between foreign nationals. The dossier details about a dozen conversations between senior Russian officials and other Russian individuals. Sources would not confirm which specific conversations were intercepted or the content of those discussions due to the classified nature of US intelligence collection programs.

But the intercepts do confirm that some of the conversations described in the dossier took place between the same individuals on the same days and from the same locations as detailed in the dossier, according to the officials. CNN has not confirmed whether any content relates to then-candidate Trump.

The corroboration, based on intercepted communications, has given US intelligence and law enforcement "greater confidence" in the credibility of some aspects of the dossier as they continue to actively investigate its contents, these sources say.

Reached for comment this afternoon, White House Press Secretary Sean Spicer said, "We continue to be disgusted by CNN's fake news reporting."

Read More