Stocks tumble as market leaders turn losers Yahoo FinanceStocks hammered by renewed growth concerns, Nvidia’s selloff ReutersNikkei sees worst day since early August sell-off; Taiex leads losses in Asia as tech stocks fall CNBC‘Buy the Dip’ Back on Traders’ Radar After Nvidia Fuels Selloff BloombergNikkei index sinks 4% in morning on U.S. economy fears Kyodo News Plus