This is just one of our articles referencing the financial crisis, crash of the housing market, subprime, and more:

SIVs are investment vehicles which raise money in the short-term commercial paper market and use it to invest in longer-term assets, such as mortgages. In many cases investors let their money roll over, but recently investors have been demanding their money back. It has obliged many of the SIVs to make a forced sale of their assets at a time when the assets themselves are also losing their value.