Documents on UK-US trade talks, leaked ahead of the 2019 general election, were stolen from an email account belonging to Tory MP Liam Fox, it has been reported.
The articles were posted online and used by Labor as part of the 2019 campaign to claim the NHS would be in jeopardy.
The British government said the Russians were almost certainly seeking to interfere in the election through documents.
A criminal investigation into the leaked documents is underway.
A spokesperson for the National Crime Agency confirmed he was leading the investigation, but added that he could not say more.
Mr. Fox was Secretary of International Trade from July 2016 to July 2019.
It is not known when his account was accessed and the information stolen.
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Reuters, which first reported the story, said hackers accessed Mr. Fox’s account on multiple occasions between July 12 and October 21 last year.
A government spokesperson said: “A criminal investigation is underway into how the documents were acquired, and it would be inappropriate to comment further at this point.
“But as you can imagine, the government has put in place very robust systems to protect the IT systems of government officials and staff. ”
A spokesperson for the National Cyber Security Center said it is working closely with MPs and political parties to provide “the best advice and support on cybersecurity.”
“We have been working closely with political parties for several years on how to protect and defend against cyber attacks, including posting tips on our website.
“A criminal investigation is underway and it would be inappropriate to comment further at this point. “