The mystery of Wuhan – did the Covid-19 outbreak originate in a state laboratory there? – has now reached a new level. The US Secretary of State, Mike Pompeo, has added his powerful voice to those asking for the truth.

The US State Department, in a document of great sobriety and caution, did not suggest that the virus was intentionally engineered or released on purpose.

Even so, it flatly accused China’s ruling Communist Party of systematically preventing a proper investigation into the origin of the pandemic.