US stocks retreat as Spain's debt downgraded

US stocks ended their worst month in more than a year by sliding again on more unsettling news about Europe.

The Dow Jones industrials index dropped 122 points today after Fitch Ratings gave Spain the second downgrade of its credit rating in a month. The rating agency’s action was another reminder to traders of the long-term economic problems still facing several European countries, and perhaps the rest of the continent and the global economy as well.