NY probing banks for possible forex manipulation

More than a dozen banks are being probed by the New York Department of Financial Services regarding possible manipulation in the foreign exchange markets, according to a source close to Benjamin Lawsky, a top financial regulator.

The banks, which all have their state charters in New York, include Goldman Sachs, Deutsche Bank, Credit Suisse, RBS, Societe Generale and Standard Charter.

The source could not comment on whether the NY Department of Financial Services was working in tandem with other U.S regulators.

—Written by CNBC's Katie Little. Reported by CNBC's Mary Thompson