(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.

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