The London offices of Cambridge Analytica have been searched by enforcement officers from the UK's information commissioner.

The High Court granted the data watchdog a warrant amid claims the firm amassed information about millions of people without their consent, based on a 2014 quiz on Facebook.

The seven-hour search finished in the early hours of Saturday.

Both Cambridge Analytica and Facebook deny any wrongdoing.

A group of people, some wearing ICO enforcement jackets, entered the building housing Cambridge Analytica's London headquarters at 20:00 GMT on Friday - less than an hour after a high court judge granted the warrant.

Several hours later members of the Information Commissioner's Office  were seen leaving the offices and a van - thought to be carrying gathered evidence - was driven away from the rear of the building.

The ICO applied for the warrant to access the databases and servers of Cambridge Analytica.

The search is part of a wider investigation into political campaigning.