Breaking: Dow Closes Down 126.82

All last week, the stock market lost money, dropping slowly towards the 10,000 mark. On Friday it closed upwards about 120 points, cheering analysts that the week ended "on a high note." Today, the Dow lost all of Friday's gain and more, closing at 10066.57... down 126.82 from its opening price of 10193.93.
http://www.investors.com/NewsAndAnalysis/Article/534899/201005241619/US-Stocks-Close-Lower-After-Late-Sell-Off.aspx

The Nasdaq fell 0.7%, the Dow 1.2%, the S&P 500 1.4% and the NYSE composite 1.6%. Volume fell from Friday's heavy trading amid options expirations.

Financials were among the day's poorest sectors. The energy sector weakened further, accounting for some of the day's worst industry groups.

The Dow is flirting with the 10,000 mark, which is considered a danger mark. If the market closes below 10,000, it is an indicator of a probable shift from a bull market to a bear market.