Four people have been arrested on suspicion of conspiracy to defraud, conspiracy to launder money and possession of an explosive.
The two men and two women were detained as part of an investigation led by the Metropolitan Police's new Cyber Crime Unit.
The men are currently in custody at a central-London police station and the women have been bailed to return on a date early next year.
More top news
A look ahead to the weather forecast for today across the UK.
The first official report since HMP Birmingham was hit by a riot has found "violence had increased substantially" since the last inspection.
Actor Michael Nyqvist, famed for starring in the original film adaptation of The Girl With the Dragon Tattoo, has died aged 56.