Stock-index futures extended their slide in early Sunday night trade, falling by their 5% daily limit. Futures on the Dow Jones Industrial Average YM00, +0.01% DJIA, -0.87% were down 1,041 points at 21,798, while S&P 500 futures ES00, +0.03% SPX, -1.11% were off 128.40 points at 2,555.50. Nasdaq-100 futures were 359.75 points lower at 7,541. The drop comes after the Federal Reserve announced a range of emergency measures, including a sharp cut in interest rates and $700 billion in asset purchases. Fed Chairman Jerome Powell is scheduled to hold a news conference at 6:30 p.m. Eastern.