A British judge has issued a warrant for the offices of Cambridge Analytica in England to be searched.
The UK's Information Commissioner Elizabeth Denham wants access to records and data in the hands of the London-based company amid claims that Facebook data may have been illegally acquired and used for political campaigns.
Both Cambridge Analytica and Facebook deny any wrongdoing.
The data watchdog's investigation includes the acquisition and use of Facebook data by Cambridge Analytica, its parent company SCL and academic Dr Aleksandr Kogan, who developed the app used to gather data.
It stems from claims over the harvesting of personal data - and whether it was used during Donald Trump's US presidential campaign or the Brexit referendum.
Cambridge Analytica's chief executive Alexander Nix has been suspended while Facebook founder Mark Zuckerberg has been called on to give evidence to MPs.
After a hearing at London's High Court today, Judge Leonard said he would give the reasons for his decision on Tuesday.