Mass testing has begun in Beijing's largest district, Chaoyang .
China is racing to track a COVID-19 outbreak that may have been spreading in the capital for a week.
Beijing residents have been rushing to buy essential items, amid concerns that a widespread lockdown could be imposed.
It comes amid fears that Beijing could face a similar situation to Shanghai, which has seen some 25 million people shut in their homes for weeks.

Al Jazeera’s Katrina Yu joins us live from Beijing for the latest updates.

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