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.
In the early hours of Sunday, officers 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, Scotland Yard said.
A 29-year-old woman was arrested in Brent, and a 23-year-old man was arrested in Tower Hamlets, London.
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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.
“These are significant arrests,” said Detective Superintendent Sian Thomas.
“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 to intervene successfully.”