In a wide-ranging speech to the London School of Economics, Bernanke said it may be necessary to provide more capital injections and loan guarantees to banks and financial firms to stabilize credit markets.

Bernanke, who didn’t weigh in on the details of the evolving U.S. economic stimulus package, made clear that it is should be only part of a broader government response to combat the worst financial crisis to hit the U.S. and the global economy since the 1930s.