Story updated with detailed information.
- Berkshire Hathaway invests $5 Billion In Bank of America
- Warren Buffet calls Bank of America a "strong, well-led company"
- Shares up 23% at $8.58 in premarket trading
The credit derivatives market is worth trillions, but are they really a time bomb waiting to decimate the financial markets? Warren Buffett's warnings haven't scared Citigroup.