The FBI is currently working on at least three separate investigations related to Russian-backed hacking during the U.S. presidential election, Reuters reported Saturday.

According to the report, three investigations are being pursued out of different offices — one in San Francisco, one in Pittsburgh and one in Washington, D.C.

The FBI's Pittsburgh field office is working to identify those behind breaches of the Democratic National Committee's computer systems, officials told Reuters. This investigation has progressed the furthest of the three, but not far enough to offer clear evidence for an indictment.

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A San Francisco office is working to identify the group "Guccifer 2," believed to be behind leaked emails stolen from Clinton campaign chairman John Podesta's account.

The final investigation in Washington is doing counterintelligence work and looking into leads from informants and foreign communications surrounding the hacking allegations.

Reuters reported the counterintelligence work is probing links between Russian individuals and companies and others with links to Trump.

FBI Director James Comey met with lawmakers Friday from the Senate Intelligence Committee behind doors amid uproar over Russia and allegations that members of Trump's campaign were in contact with Russian officials.