Central bankers and finance ministers from the Group of Seven industrially advanced nations held an emergency conference call Tuesday to discuss the euro zone's deepening financial crisis.

Financial and monetary leaders from the U.S., Canada, Japan, Germany, Italy, France and Great Britain were expected to discuss ways to recapitalize the weakest European banks, particularly those in Spain, in order to keep the monetary union together.

A lack of confidence that anything decisive would emerge from the meeting left U.S. stock futures lower.