“Russian cyberactors were in a position to delete or change voter data”

The report — the first volume of several to be released from the committee’s investigation into Russia’s 2016 election interference — came 24 hours after the former special counsel Robert S. Mueller III warned that Russia was moving again to interfere “as we sit here.”

While details of many of the hackings directed by Russian intelligence, particularly in Illinois and Arizona, are well known, the committee described “an unprecedented level of activity against state election infrastructure” intended largely to search for vulnerabilities in the security of the election systems.

It concluded that while there was no evidence that any votes were changed in actual voting machines, “Russian cyberactors were in a position to delete or change voter data” in the Illinois voter database. The committee found no evidence that they did so.