“The package was assessed. It was deemed not to be suspicious. Police cordons have now been removed,” the police said.

The London-based political consultancy has been at the centre of a storm this week after a whistleblower said the company had paid an academic to harvest the data of 50 million Facebook users to build profiles of American voters before the 2016 U.S. election.

Britain’s Information Commissioner has said it is seeking a warrant to raid the office. The company’s CEO has been suspended.

Cambridge Analytica’s London office is based on New Oxford Street, one of Britain’s main shopping streets in the centre of the capital.