USA intelligence agencies concluded that the accounts were hacked as part of a wide-ranging operation ordered by Putin to damage Clinton's bid for the presidency and assist Trump's campaign.
Special Counsel Robert Mueller indicted 12 Russian military intelligence officers linked to hacking the Democratic National Committee in 2016 and other email accounts in an effort to interfere with the 2016 election.
Deputy Attorney General Rod Rosenstein says that Russian intelligence agents stole information on 500,000 US voters after hacking a state USA election board.
A federal grand jury on Friday indicted the Russian intelligence officers on charges of hacking the computer networks of 2016 Democratic presidential candidate Hillary Clinton and the Democratic Party, he said.
Trump told reporters in London Friday that he will "absolutely firmly" ask Putin about the finding by USA intelligence agencies that he authorized the campaign of interference.
Deputy Attorney General Rod Rosenstein announced the indictments at a press conference, which took place just after Trump and his wife, Melania, arrived at Windsor Castle for a ceremony with Queen Elizabeth as part of the president's European visit. They are accused of releasing the stolen emails on a website, dcleaks.com.
The groups created the online personas DC Leaks and Guccifer 2.0 used to release the stolen emails, claiming that DC Leaks was a group of American hackers and Guccifer 2.0 was a lone hacker, but Rosenstein said both actually worked for Russian intelligence.
The charges were brought as part of special counsel Robert Mueller's investigation into whether there was any collusion between Donald Trump's campaign and Russian Federation.
There is no allegation in the indictment that any American participated knowingly in the GRU cyberattacks, Rosenstein said. "It's important for the president to know what evidence we have of foreign interference".
In February, Rosenstein called a surprise news conference to announce the indictment of 13 Russian nationals and a Kremlin-linked internet company for alleged meddling in the 2016 election.