A man has been charged over alleged plans to disrupt the London Stock Exchange, the Metropolitan Police has said.
Sean Middleborough, 31, from Liverpool, will appear at Wirral Magistrates' Court on Monday charged with conspiracy to cause a public nuisance.
He was arrested in the early hours of Sunday on suspicion of conspiracy to cause criminal damage.
A further five people, all believed to be part of the same alleged plot, were arrested later on Sunday on suspicion of the same offence, Scotland Yard said.
The five others - three women and two men - have been bailed pending further enquiries.
They are a 29-year-old woman who was arrested in Brent, northwest London, and a 23-year-old man was arrested in Tower Hamlets, east London.
Two women, aged 28 and 26, were arrested in Liverpool, while a 27-year-old man was arrested in Brighton.
All six remain in custody.