Federal Reserve Board Governor Daniel Tarullo.

Global regulators need more policy tools to counter the risk of devastating bank runs and should have powers over a wide array of market participants, U.S. Federal Reserve Governor Dan Tarullo said on Friday.

"There is a need to supplement prudential bank regulation with a third set of policy options in the form of regulatory tools that can be applied on a market-wide basis," Tarullo said at a conference on shadow banking.