All 12 defendants are Russian military intelligence operatives who, according to Rosenstein, created and used the "DCLeaks" and "Guccifer 2.0" identities to leak the information they stole from the DNC while implying they were Americans.
Hillary Clinton's campaign organization and the Democratic National Committee may have been targets, including Clinton campaign chairman John Podesta, but Rosenstein declined to identify them.
In February this year, Mueller's team unveiled criminal charges against 13 Russians and three Russian companies for interfering in the presidential campaign, using social media and coordinating with low-level Trump campaign activists.
"I briefed President Trump about these allegations earlier this week".
It stems from Special Counsel Robert Mueller's probe into Russia's efforts to interfere in the 2016 presidential election. The current indictment did not allege that any Americans committed crimes related to the Russian hacking, Rosenstein announced.
DOJ reopens Emmett Till case after ‘new information’ arises
Relatives of Till pushed Attorney General Jeff Sessions to reopen the case previous year after publication of the book. Till was just 14 years old visiting family in MS when a white woman said he had made crude sexual advances toward her.
Mueller has been investigating the Trump campaign's ties to Russian Federation, as well as possible obstruction of justice on the part of the president, for more than a year.
He also said the Russian defendants infiltrated computers at US state boards of election and secretaries of state, plus software suppliers whose products help election officials verify voter registration data.
Rosenstein's announcement took place just ahead of a planned meeting between President Trump and Russian President Vladimir Putin on Monday in Helsinki.
Rosenstein said there is no allegation that USA citizens were involved in the alleged crimes described in the indictment.
A few hours before the indictments were announced, Trump described the Mueller investigation as a "rigged witch hunt" that is hurting the US relationship with Russian Federation. Trump told reporters on his visit to the United Kingdom on Friday that he planned to "ask" Putin about Russia's attack on the election.