Investors decided the risk of a conflict with Syria is shrinking and sent stock prices higher.

The Dow Jones industrial average rose 135.54 points to 15,326.60 Wednesday. A big decline in Apple and other technology companies held back the Standard & Poor's 500 index, which edged up 0.31 percent, to 1,689.13. The tech-heavy Nasdaq composite fell 0.11 percent to 3,725.01.

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U.S. and Russian diplomats are working on a plan that would lead to Syria giving up chemical weapons that President Barack Obama says were used against civilians. Obama said the United States will explore a possible diplomatic solution, though the U.S. military remains ready to attack.

After a tough August, stocks have been rising in September. The S&P 500 is up 3.4 percent so far this month. Since September began, a U.S. strike on Syria has gone from seeming imminent to being something that may or may not ever happen.

The yield on the 10-year Treasury note fell to 2.92 percent from 2.97 percent a day earlier.

Traders on the floor of the New York Stock Exchange observed a moment of silence shortly before trading began on the 12th anniversary of the Sept. 11 terrorist attacks. -- AP