Concern about mounting debt in Europe has pushed the Dow Jones industrials below 10,000.

The Dow closed below the psychological barrier for the first time in three months Monday as financial stocks pulled the market lower.

Mounting debt problems in several weaker European economies including Greece, Portugal and Spain have raised new questions about the health of the global financial system.

According to preliminary calculations, the Dow has ended down 104 at 9,908. The Standard & Poor's 500 is down 9 at 1,057. And the Nasdaq composite index is off 15 at 2,126.

Two stocks fell for every one that rose on the New York Stock Exchange. Volume came to 1.1 billion shares compared with 1.6 billion shares Friday.