Climate change protestors scaled the BBC's Portland Place headquarters and blocked staff from entering or leaving the building.
The Extinction Rebellion activists demanded that the BBC devote more coverage to climate change.
The latest action comes as a two week long climate change protest in London entered its fifth day. Metropolitan Police Chief Cressida Dick wrote in the Evening Standard that the force has had to withdraw from other areas of policing to deal with the protests.
Protests continue in Trafalgar Square, where arrests have been made.