Currency trading at more than a dozen banks is being examined by New York’s Department of Financial Services, reports Reuters.

The regulator is looking into whether the banks manipulated currency markets.

Read: Loonie will drop to 87 cents: BMO economist

Firms under the microscope include Goldman Sachs and Deutsche Bank, as well as Credit Suisse, Lloyds Bank and the Royal Bank of Scotland.

The regulator has requested documents relating to how they trade currency from the institutions.

Read more here.

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