Wall Street on Monday extended its slump into yet another week as investors worried that even a safety net set up for mortgage financiers...

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NEW YORK — Wall Street on Monday extended its slump into yet another week as investors worried that even a safety net set up for mortgage financiers Fannie Mae and Freddie Mac won’t head off further troubles in the financial markets.

The Dow Jones industrial average fell 45.35 to 11,055.19 after spiking nearly 140 points in early trading.

Microsoft, one of the 30 Dow stocks, closed off 10 cents at $25.15 a share. Boeing, also a Dow stock, fell 9 cents to $63.19.

Broader stock indicators also dropped. The Standard & Poor’s 500 index fell 11.19 to 1,228.30, and the Nasdaq composite index fell 26.21 to 2,212.87.

Worries over Fannie Mae and Freddie Mac on Friday led to a volatile session in which the Dow dipped below the 11,000 mark for the first time in about two years before paring its losses; the market suffered its fourth straight losing week.

Investors’ latest unease about the banking sector comes in a week when many financial names are to issue quarterly reports — many of which will likely include sizable write-downs of souring mortgage debt.

Wall Street has been on edge about the well-being of Fannie Mae and Freddie Mac because they together hold or back $5.3 trillion of mortgage debt, about half the outstanding mortgages in the United States.

Trading in shares of regional bank National City was briefly halted as the company responded to rumors of financial troubles. The bank said in a statement it is experiencing “no unusual depositor or creditor activity” and that as of Friday’s close it had more than $12 billion of excess short-term liquidity.