US stocks open lower as oil prices, Treasury yields rise; Dow drops over 300 points

US stocks opened lower on Monday, September 28, with the Dow Jones Industrial Average falling more than 300 points, as rising oil prices and a jump in Treasury yields weighed on sentiment amid renewed US-Iran tensions.The Dow fell 377 points, or 0.7%, while the S&P 500 and Nasdaq Composite each dec…