US officials have officially accused Russia of cyber attacks against political organisations in order “to hinder the US election”.
Recent hacked emails are “consistent with the strategies and motivation of Russia-directed efforts”, the Department of Homeland Security said.
Info disclosing conversations within the Democratic Party was hacked earlier this year.
Some states reported “probing” efforts made on “election-related” systems.
Nevertheless, officials said those efforts couldn’t be linked to the Russian government.
“We believe, predicated on the scope and sensitivity of these efforts, that only Russia’s senior-most officials could have authorized these actions,” they said.
However, changing any actual ballots or election results would be “extremely hard”, they added, due to a decentralised system and multiple checks and balances.
Several uncomfortable e-mails have come to light during the 2016 election campaign.
In July, a hacker calling himself Guccifer 2.0 claimed responsibility for the release of documents from the Democratic Party.
Gigabytes of files including e-mails and other documents that revealed the inner workings of the Democratic
National Committee (DNC) were taken.
At an early period, many US officials linked the infraction to Russia. At enough time, Moscow refused any participation and denounced the “vicious anti-Russian” rhetoric from Washington.
The leaked emails appeared to demonstrate that Democratic Party officials were biased against Bernie Sanders in his primary race against Mrs Clinton.
The hack started demonstrations at the national convention in Philadelphia and led to the resignation of the party chairwoman Debbie Wasserman Schultz.
Adam Schiff, a senior person in the House of Representatives Intelligence Committee, said he applauded your decision to publicly identify Russia as the perpetrator.
He called for cooperation with “our European allies” to develop a reply.