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Thirteen Russians have been charged with interfering in the US 2016 election, in a major development in the FBI investigation.
Three of those named have also been accused of conspiracy to commit wire fraud and five have been accused of aggravated identity theft.
The announcement was made by Special Counsel Robert Mueller, who is investigating alleged Russian meddling.
Three Russian companies are also named in the indictment.
What does the indictment say?
It says a group of Russians:
Posed as Americans, and opened financial accounts in their name
Spent thousands of dollars a month buying political advertising
Purchased US server space in an effort to hide their Russian affiliation
Organised and promoted political rallies within the United States
Posted political messages on social media accounts that impersonated real US citizens
Promoted information that disparaged Hillary Clinton
Received money from clients to post on US social media sites
Created themed groups on social media on hot-button issues, particularly on Facebook and Instagram
Operated with a monthly budget of as much as $1.25m (£890,000)
Financed the building of a cage large enough to hold an actress portraying Hillary Clinton in a prison uniform
The indictment says those involved systematically measured how well their internet posts were doing and adjusted their strategies to maximise effectiveness.
It also says those named in the indictment had visited the US posing as American citizens and had begun discussing how to affect the election as early as 2014.
"By 2016, defendants and their co-conspirators used their fictitious online persons to interfere with the 2016 US presidential election," the indictment continues.
"They engaged in operations primarily to communicate derogatory information about Hillary Clinton, to denigrate other candidates such as Ted Cruz and Marco Rubio, and to support Bernie Sanders and then-candidate Donald Trump."
Mr Trump was briefed on the indictment earlier on Friday, White House spokeswoman Sarah Sanders said.
The president later tweeted that his campaign had done nothing wrong.
US politicians from both major parties have responded with calls for social media companies like Facebook to do more to prevent political interference via their platforms.
Facebook said in a statement that it had worked "proactively" with Mr Mueller's investigation, but admitted that it had "more to do to prevent further attacks".
How has Russia reacted?
"There were 13 of them, according to the US Department of Justice. Thirteen people interfered with the US elections?" said Maria Zakharova, a Russian foreign ministry spokesman.
"Thirteen against the billion-dollar budgets of the security services? Against espionage and counter-espionage, against new developments and technologies? Absurd? Yes."
One of the men named in the indictment - Yevgeny Prigozhin, who is known as "Putin's chef", denied election tampering.
"The Americans are very impressionable people, they see what they want to see," he was quoted as saying by Russian news agency Ria Novosti on Friday. "I have great respect for them. I'm not at all upset that I'm on this list. If they want to see the devil, let them see him."
Mr Prigozhin has been a friend of Mr Putin since the 1990s. He has built up a business empire and has been accused of using companies to diffuse pro-Kremlin opinions via fake internet identities.
（BBC）
