US STOCKS-Credit worries return, driving Wall St lower

(Reuters) - NEW YORK, July 31 - U.S. stocks tumbled on
Tuesday as worries about the deteriorating credit market
resurfaced with news of another mortgage lending casualty.




Stocks had risen Monday and the first half of Tuesday's
session, but the relief rally was cut short when American Home
Mortgage Investment Corp. said it may have to
liquidate assets. Shares of the mortgage lender fell 90
percent.


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