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By Phil Stewart and Robin Emmott BRUSSELS (Reuters) - The United States pressed allies on Thursday to contribute more to a U.S.-led military campaign against Islamic State that it says must be accelerated, regardless of the fate of diplomatic efforts to end Syria's civil war. U.S. Defense Secretary Ash Carter started talks on Thursday in Brussels with more than two dozen defense ministers, including from key ally Saudi Arabia, which renewed its offer potentially to send troops into Syria.
Wall Street stocks sharply extended losses Thursday morning after Federal Reserve Chair Janet Yellen said it was "premature" to assess the impact of global market turmoil on the US economy. Near 1650 GMT, the Dow Jones Industrial Average was at 15,570.85, down 343.89 points (2.16 percent). The broad-based S&P 500 fell 33.61 (1.81 percent) to 1,818.25, while the tech-rich Nasdaq Composite Index dropped 59.05 (1.38 percent) to 4,224.54.