Stock futures are little changed after worst S&P 500 day since early August rout: Live updates CNBCDow falls by more than 600 points as September turns ugly CNNStocks stumble as growth worries resurface, tech shine dims Yahoo FinanceDow closes 600 points lower to begin September, S&P 500 drops 2%: Live updates CNBCFears of Economic Slowdown Spark Stock-Market Selloff The Wall Street Journal