Six people have been arrested over a suspected plot to disrupt the London Stock Exchange, the Metropolitan Police has said.
The force said it began its investigation after receiving information from the Daily Express on Friday.
Activists from the Palestine Action group were allegedly intending to target the London Stock Exchange on Monday morning.
It was claimed they were intent on causing damage and were going to “lock on” in an attempt to stop the building from opening for trading.
Police arrested a 31-year-old man in Liverpool on suspicion of conspiracy to cause criminal damage.
A further five people, all believed to be part of the same plot, were arrested later on Sunday for the same offence.
A 29-year-old woman was arrested in Brent, and a 23-year-old man was arrested in Tower Hamlets, London.
David Cameron warns of ‘danger and instability’ in the world as he defends UK strikes on Houthi targets
Cameron ‘doesn’t recall’ being briefed on Post Office scandal as PM – but sorry for ‘appalling miscarriage of justice’
Donald Trump re-election could threaten UK’s national security, claims ex-MI6 boss
Two women, aged 28 and 26, were arrested in Liverpool. A 27-year-old man was arrested in Brighton.
All six remain in custody.
Detective Superintendent Sian Thomas said: “These are significant arrests. We believe this group was ready to carry out a disruptive and damaging stunt which could have had serious implications had it been carried out successfully.
“I’m grateful to the Express for their willingness to provide the information gleaned from their own investigation. It was instrumental in helping us intervene successfully.”