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.

New measures have been announced in Europe to tackle the threat posed by the debt crisis and

stalling

economic growth.

The European Central Bank is offering unlimited loans to banks for as much as a year in order to

stave off

a possible

credit crunch

. The Bank of England says it's going to

pump

another $116bn into the British financial system to boost economic activity.

Anti-corruption investigators in Nigeria have arrested three former state governors for alleged crimes of

embezzlement

. They are accused of fraud involving hundreds of millions of dollars of public funds. Jonah Fisher reports from Lagos.