RBS tried to manipulate the U.S. Dollar International Swaps and Derivatives Association Fix (USD ISDAFIX) rate from 2007 to March 2012, the CFTC said in a statement. "RBS engaged in the unlawful conduct in order to benefit certain derivatives positions it held that were priced or valued off of the USD ISDAFIX benchmark," it said.  

(Reporting by Eric Walsh)