BBC News with Jonathan Izard

President Obama has urged eurozone leaders to act fast to resolve their debt crisis, saying it poses a threat to America's faltering economic recovery. Mr Obama said Europe's economic uncertainty was the biggest headwind currently facing the United States.

"Uncertainty around Greece and their ability to pay their debts runs on - in the capital markets - on, you know, the debt that many of these southern European countries have been facing as well as Ireland and Portugal, all that's put severe strain on the world financial system."

Mr Obama said he spoke frequently with the French and German leaders and was convinced they and their European colleagues understood the urgency of the situation.