China's southwestern city of Chengdu has said it had conducted 30,000 Covid-19 tests on visitors at a mega entertainment centre, and rounded-up those who tried to flee the site, in the second mass screening at a large venue in days.

All Covid-19 tests returned negative results, reported the official China Central Television.

Those present were required to return home to await their results and not venture outdoors until advised, local authorities in Chengdu said in a notice.

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