The staff at the state-funded BBC's headquarters and surrounding buildings in central London have been evacuated briefly due to a suspicious vehicle.
The Metropolitan Police said the alert, which is now over, was not specific to the BBC, and related to a vehicle parked on nearby Regent's Street.
In addition to the BBC, Portland Place in central London is also home to the Chinese and Polish embassies, Kenyan High Commission and the Royal Institute of British Architects, as well as several schools and hotels.
Police in the UK remain on a heightened state of alert following the terror attacks in Paris last month. They have appealed for the public to remain vigilant.