WASHINGTON — Federal Reserve Board Gov. Daniel Tarullo said Thursday that his top concern continues to be access by the largest financial firms to wholesale funding markets that can tip off runs and liquidity freezes.

Speaking at the sidelines of the International Monetary Fund's Spring Meeting to Bloomberg TV, Tarullo said U.S. financial institutions are much safer than they were four years ago as a result of yearly stress tests that have doubled the amount of common equity capital they hold and a resolution regime created by Congress to safely unwind banks.

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