The FSA called a halt to short selling of financial stocks in the UK. As a result, many (t)raders have had to get themselves out of short positions. That musta hurt!
The second, much bigger, reason is that the US Treasury Secretary, Hank Paulson, in collusion with the US Congress, is about to commit an act of blatant treason.
Instead of doing the right thing, which would have been to place the system in administration (bankruptcy reorganization), he has decided to make the United States itself bankrupt.
The bankers are laughing up their sleeves.