First it was this from S&P: [More here from HousingWire]

S&P, one of the three main credit-rating agencies that served as enablers of the subprime-mortgage boom, announced Tuesday that it would lower its ratings on 612 bonds, a small portion of the mortgage-backed securities it had given its seal of approval to.

Then at closing bell, there was this announcement from Moody’s:

Moody’s Investors Service said late Tuesday that it downgraded 399 residential mortgage-backed securities because of higher-than-expected delinquencies on the underlying home loans. The rating agency also said it put 32 other residential mortgage-backed securities (RMBS) under review for possible downgrades for the same reason. The RMBS were sold in 2006 and are backed mainly by first lien adjustable- and fixed-rate subprime mortgage loans, Moody’s added.

And if you  figure that’s the end of it, check out today’s ABX- here’s AAA and AA  [and this isn't subprime folks].

Marketwatch had this "cheery" assessment after S&P’s announcement:

A lot of debt will be downgraded to junk status. A lot of that debt will have to be sold at fire-sale prices. A lot of pension funds and hedge funds that once thrived on the high returns they could get from investing in subprime junk will now lose a lot of money.
S&P’s announcement is a death warrant for the subprime industry.