This video, uploaded to the social networking site Instagram, purports to show crowded scenes in Shanghai before a stampede.
Crowds gathered in the city to watch a concert put on to celebrate the new year.
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.