SFO has announced the closure of its investigation into allegations of fraudulent conduct in the foreign exchange market. SFO has concluded that despite grounds to suspect offences involving serious or complex fraud, a review of the available evidence suggests that the alleged conduct, even if proven, would not meet the evidential test required for SFO to mount a prosecution and it would not be able to remedy this by continuing the investigation. The US Department of Justice is still continuing its investigation, with which SFO is helping it. (Source: SFO closes forex investigation)