text:  Securities in Portland, Oregon, say they are looking into four suspected heat-related deaths there. That's as the area continues to deal with an ongoing heat wave, a long-running heat wave expected to continue to hold much of the nation in its grip today, including large parts of the East Coast and the South. Over the weekend in California's Death Valley, the mercury hit 128 degrees. Stocks were mixed today. The Dow was down 31 points. This is NPR.