(Updating with IMF quotes) WASHINGTON (Thomson Financial) - Defaults and foreclosures in the US sub-prime mortgage market have led to increased uncertainty in the US, but these risks appear to be contained and should not pose a risk to the overall economy, the International Monetary Fund (IMF) said today in its updated World Economic Outlook report. 'In sum, risks have increased and credit markets could remain volatile in the period ahead with a further repricing of some credit products,' the IMF said in its financial market update. 'However, so far, our assessment is that this risk is likely to remain largely ... (full story)