Central bank stands ready to take more action to boost recovery, Fed chairman says.

At June FOMC meeting, a few policy makers saw need for Fed to do more.

At June FOMC meeting, a few policy makers saw need for Fed to do more.

Bernanke signals that additional stimulus is likely if jobs growth falls short.

Bernanke signals that additional stimulus is likely if jobs growth falls short.

Program to be expanded by $267 bln through year-end.

Program to be expanded by $267 bln through year-end.

Fed chairman cites Europes debt crisis and U.S. fiscal cliff.