NEW YORK, March 10 -- Private-equity firm Blackstone Group said Monday that it swung to a loss during the fourth quarter because of a write-down on its investment in bond insurer Financial Guaranty Insurance Co. and deterioration in the credit markets.

NEW YORK -- Private equity firm Blackstone Group LP said Monday it swung to a loss during the fourth quarter due to a write-down on its investment in bond insurer Financial Guaranty Insurance Co. and deterioration in the credit markets.