US President Barack Obama has said world leaders had signed up to significant steps to secure the continuing global economic recovery.

Mr Obama, who made the comments at the end of the G20 Summit in Pittsburgh last night, said it was important that the world did not slide into the economic cycle of boom followed by bust.

Mr Obama hailed the outcome of the Pittsburgh summit as an outstanding success.

He said the G20 leaders had agreed to launch a new framework to generate strong sustainable and balanced global growth.

The President added that ordinary people around the world would not tolerate going back to a boom and bust global economy.

In answer to a question on Iran's nuclear programme, he said the Iranians were on notice to come clean on what exactly they were doing at their second, secret nuclear facility.

When asked about a military option, the US President said he was not ruling anything in or out, but added his preferred solution was a diplomatic one.