Five of the world's biggest banks are to pay fines totalling £2 billion after regulators today lifted the lid on the latest scandal to rock the industry.
Taxpayer-funded Royal Bank of Scotland (RBS), along with HSBC, Citibank, JPMorgan Chase and UBS have all been fined, while a separate investigation into Barclays is ongoing.
The penalties have been doled out by three bodies, including the UK's Financial Conduct Authority (FCA), and relate to the rigging of the £3 trillion-a-day foreign exchange markets, adding to the large sums already collected over Libor fixing.
Fed up with your bank? Switch today
The FCA has issued record fines worth £1.1 billion on five banks for failing to control business practices in their foreign exchange trading operations.
In the US, the Commodity Futures Trading Commission (CFTC) has fined the same banks a total of more than $1.4bn (£900m).
The third body, Switzerland's FINMA, has penalised UBS 134m Swiss francs (£87m).
Article continues below
For its part, RBS has been fined £217 million by the FCA as well as 290 million US dollars (£182 million) by the CFTC.
The FCA penalties dwarf the £532 million imposed by the regulator on banks and City brokers over the previous big regulatory scandal involving the manipulation of the interbank lending rate, Libor.
The FCA said traders at different banks formed tight-knit groups in which information was shared about client activity, including using code names to identify clients without naming them.
Names given to these groups included "the players", "the 3 musketeers", "1 team, 1 dream", "a co-operative" and "the A-team". Traders shared the information obtained through these groups to help them work out their trading strategies.
Fed up with your bank? Switch today
Don't game the system
FCA chief executive Martin Wheatley said: "Today's record fines mark the gravity of the failings we found and firms need to take responsibility for putting it right.
"They must make sure their traders do not game the system to boost profits or leave the ethics of their conduct to compliance to worry about."
An inquiry by the Bank of England found that no official was involved in any unlawful or improper behaviour in the forex market.
However one member of staff was aware that bank traders were sharing information about client orders for the purpose of "matching" - a practice that can increase the potential for improper conduct - but did not raise the alarm to superiors.
The Bank of England's review, carried out by Lord Grabiner, extracted and applied search terms to 1.8 million documents and reviewed nearly 66,000 documents and 87,000 telephone calls.
RBS said it has placed six individuals into a disciplinary process, three of whom are currently suspended, pending further investigation.
It said it has analysed millions of documents and is reviewing the conduct of more than 50 current and former members of trading staff around the world as well as dozens of supervisors and senior management.
RBS chairman Sir Philip Hampton said: "The RBS board fully accepts the criticisms within today's announcements and condemns the actions of those employees responsible for this misconduct.
"Today is a stark reminder of the importance of culture and integrity in banking and we will rightly be judged on the strength of our response."
Fines used for wider good
Chancellor George Osborne said a number of traders have been suspended or fired and the Serious Fraud Office is conducting criminal investigations.
He added: "The banks that employed them face big fines - and I will ensure that these fines are used for the wider public good.
"Today also shows why we were right to create a powerful new financial regulator, implement the conclusions of the Parliamentary Commission on Banking Standards, and set up - with the Bank of England - the Fair and Effective Markets Review.
"All of this action means the world can have confidence in the integrity of Britain's financial markets."