Regulators fine global banks $3.4 billion in forex probe

``Regulators fined five major banks $3.4 billion for failing to stop traders from trying to manipulate the foreign exchange market, the first settlement in a year-long global investigation. UBS (UBSN.VX), HSBC (HSBA.L) and Citigroup (C.N), Royal Bank of Scotland (RBS.L) and JP Morgan (JPM.N) all face penalties resulting from the probe that has also put the largely unregulated $5 trillion-a-day market on a tighter leash. ''