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Another cause was the implementation in July of stricter State VI emission standards earlier than the central government's 2020 deadline by 15 cities and provinces, Xu explained.

Another 26 suspects have been caught or persuaded to surrender by the police so far. The case has been transferred to the procuratorate.

Anthony Fauci of the US National Institutes of Health has said that "anything is possible" given the scale of the outbreak, but added that large-scale quarantines do not appear to be on the horizon.

Another 2020 contender, former Texas Rep. Beto O'Rourke, tweeted at the president: "This is racist. These congresswomen are every bit as American as you — and represent our values better than you ever will."

Another reason for the shrinking market at the plaza was the growing online book retail market established by e-commerce giants such as Amazon and Dangdang.