(Bloomberg) -- The FBI has high confidence the Russian government hacked U.S. Democratic Party groups, according to a person familiar with the findings who asked not be identified in order to speak about an ongoing investigation.

The federal investigation into the hacks has expanded based on evidence that other Democratic-affiliated groups were targeted in addition to the Democratic National Committee and the Democratic Congressional Campaign Committee. That includes the likelihood that personal e-mail accounts of party groups and officials were breached, the person said.

The findings, which have not been publicly released, reveal the extent to which the Russian government has gone to spy on -- and possibly influence -- this year’s U.S. presidential elections, and are sure to increase tensions between Washington and Moscow. The New York Times earlier reported that U.S. intelligence agencies had high confidence that Russian intelligence was behind the breach. FBI spokeswoman Jillian Stickels declined to comment about the new findings. Russia’s government has repeatedly denied accusations it was involved in the attacks.

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