The Securities and Exchange Commission is investigating Citigroup for accounting fraud and possible violations of the Foreign Corrupt Practices Act after the bank revealed a number of fake loans that had been issued from its Mexican unit, Banamex, Reuters reports. Citigroup reduces 2013FY earnings Citigroup Inc (NYSE:C) reported last Friday that it had discovered $400 million in bad loans originating from Banamex, and that it was reducing its 2013 full year earnings by $235 million, down to $16.37 billion, to account for the loss. The SEC opened its probe following the bank’s announcement. The loans went to Mexican oil services…