المصدر -  The US government has reportedly “penetrated” Russia’s telecommunications networks and electric grid to be ready to “hit back” in case Russian intelligence agencies carry out a cyberattack on election day. An anonymous senior intelligence official told NBC news that the US would only deploy its own cyber attack “if necessary”. It has been an open secret for years that the US has infiltrated critical online infrastructure of other nations like Russia and China, while the US has accused them of doing the same. The news comes the same day that the hacker “Guccifer 2.0” - a front for Russian intelligence - tweeted that it would monitor the US elections “from inside the system”. The Department of Homeland Security briefed reporters on Friday that they were “very concerned” about confusion on election day, but were confident that no breach would influence the result of the election. “Will they end up doing it? We don't know, and I think we are taking all the precautions that we can.” A spokesman from the US Secret Service told The Independent:"The Secret Service does not disclose information related to our means and methods of protective operations." Voter registration system databases in Illinois and Arizona were tampered with earlier this year. The US government has also officially accused Russia of hacking the emails of the Democratic National Committee in June.