China News Service, April 16 (Xie Yiguan) On the 15th, the three major US stock indexes closed down collectively. As of the close, the Dow fell 445.41 points, down 1.86% to 23504.35 points; the S & P 500 fell 62.70 points, down 2.2% to 2783.36 points; the Nasdaq fell 122.56 points, down 1.44% to 8393.18 points.