Regulators scour trades for clues to market plunge (AP)

[Mgtrben news]

AP - Regulators and Wall Street officials scoured millions of trades one by one Friday and canceled thousands as they sought to explain a record plunge in the stock market, undo the damage and keep it from happening again.

Source (http://us.rd.*****.com/dailynews/rss/topstories/*http://news.*****.com/s/ap/20100507/ap_on_bi_ge/us_markets_a_day_later)