Pictures which appear to show slack safety standards at the Chinese laboratory at the centre of international sus­picion over Covid-19 have been systematically deleted from its website – as Donald Trump continues to ramp up the pressure on Beijing over its potential role in the outbreak.

During the past month, Wuhan’s Institute of Virology has removed photographs of scientists working in its laboratories and edited out references to visits by US diplomats who subsequently raised the alarm about the laboratory’s work on bats.



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