US stocks tumble on fears over slower growth US stock markets follow Asia and Europe down, amid fears of a downturn in the American economy. #press https://www.bbc.com/news/articles/c6p224j24x0o?utm_source=press.coop https://ichef.bbci.co.uk/news/240/cpsprodpb/bc34/live/2b4151b0-5343-11ef-b094-c34fc6151465.jpg