(Bloomberg) -- The FBI and Homeland Security Department will release a report Thursday with technical evidence intended to prove Russia’s military and civilian intelligence services were behind hacking attacks during this year’s presidential campaign, according to a U.S. official.

The documentation will be offered in tandem with sanctions that the Obama administration announced Thursday in retaliation for the breach of Democratic National Committee e-mails as Democrat Hillary Clinton and Republican Donald Trump were campaigning for the White House. The Russian government, which has denied responsibility for the hacking, has vowed to respond to any new sanctions with unspecified counter-measures.

The joint report will include newly declassified information exposing the internet infrastructure that Russia used in the cyberattacks, including malware and computer addresses, according to the official who asked asked not to be identified before the report is made public.

The release is intended to serve two purposes: to help prove the Russian government carried out the hacking while also frustrating officials in Moscow by exposing some of their most sensitive hacking infrastructure, the official said.

Russia’s military intelligence service, known as the GRU, conducted most of the hacking with the support of Russia’s civilian intelligence service, the official said. The operation was broad, involving not only hacking the Democratic National Committee but scanning and intruding into state voter databases, the official said.

The technical evidence showing Russia did the hacking is backed up by other intelligence that remains classified, the official said.

The hackers leaked the pilfered e-mails in a bid to damage Clinton’s campaign, according to U.S. intelligence agencies. She lost to Trump who has repeatedly scoffed at the finding that Russia was behind the cyberattacks.

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