Fed's Lockhart Says House Prices May Fall Another 15%

U.S. and European banks, already burdened by losses and concerns about their financial health, face a new challenge: paying off hundreds of billions of dollars of debt coming due.

At issue are so-called floating-rate notes -- securities used heavily by banks in 2006 to borrow money. A big chunk of those notes, which typically mature in two years, will come due over the next year or so, at a time when banks are struggling to raise fresh funds. That's forcing banks to sell assets, compete heavily for deposits and issue expensive new debt.