Britain's fraud office drops forex market investigation

By Huw Jones and Jamie McGeever LONDON (Reuters) - Britain's fraud watchdog has ended an investigation into possible foreign exchange market rigging, saying it did not have enough evidence to secure convictions, in a further setback to its efforts to prosecute wrongdoers in financial markets. Some of the world's biggest banks have been fined billions of dollars for trying to manipulate foreign exchange rates after a global probe into the $5 trillion a day market. The investigation by the Serious