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At midday, the Dow Jones Industrial Average decreased 24.17 points, or 0.10 percent, to 25,296.56. The S&P 500 erased 2.11 points, or 0.08 percent, to 2,784.74. The Nasdaq Composite Index rose 12.10 points, or 0.16 percent, to 7,715.90.

At another conference on power and battery development, Xin said that the development of high-efficiency special batteries is key to the development of e-vehicles in China.

Asked about the implementation of additional US and Chinese tariffs, the proportion of members who said it would have a negative impact jumped to 74.3 percent and 67.6 percent, respectively, with the percentage of companies reporting a "strong negative impact" doubling from 21.5 percent to 47.2 percent for the US tariffs.

At an online briefing in Geneva on Monday, Mike Ryan, top emergencies expert of the World Health Organization, said the WHO welcomed recent clinical trial data for remdesivir, saying there were "signals of hope" for the potential use of the drug in COVID-19 patients.

At least 19 had been identified so far, while DNA testing was being carried out at the University of Karachi to help name the rest of the victims.