Washington DC's top prosecutor is suing Facebook in the first significant US move to punish the firm for its role in the Cambridge Analytica scandal.
District of Columbia Attorney General Karl Racine filed the lawsuit on Wednesday, said the Washington Post.
It accused Facebook of allowing the wholesale scraping of personal data on tens of millions of users.
The action adds to a number of regulatory investigations, following a year of privacy and security missteps.
A Facebook spokesperson told the BBC: "We're reviewing the complaint and look forward to continuing our discussions with attorneys general in DC and elsewhere."
Facebook's data-sharing deals exposed
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