Senators Call for More Vigorous Libor Probe

A group of Democratic U.S. senators on Thursday pressured Attorney General Eric Holder and financial regulators to step up investigations into whether global banks manipulated benchmark interest rates.

The senators, including Carl Levin, Jack Reed and Dianne Feinstein, said investigators should also look into allegations that U.S. and foreign bank regulators may have been aware for years of wrongdoing in the setting of the London Interbank Offered Rate, or LIBOR.

"Just like the banks and executives they oversee, regulators who were involved should be held to account for any failures to stop wrongdoing that they knew, or should have known about," the senators said in a letter dated Thursday to Holder, Treasury Secretary Timothy Geithner and members of the Financial Stability Oversight Council.