U.S. stocks closed lower on Monday, with the Dow cementing a sixth straight session in a row of declines, as investors worried about possible next steps in the Mideast conflict. The Dow Jones Industrial Average shed 248.13 points, or 0.7%, ending at 37,735.11. The S&P 500 index dropped 61.59 po Read this story at Marketwatch , Marketwatch , Marketwatch