US President Donald Trump has threatened China with fresh tariffs as he stepped up his attacks on Beijing over the coronavirus crisis, saying he had seen evidence linking a Wuhan lab to the contagion.

The diatribe from the Republican incumbent came as data showed the United States shed more than 30 million jobs in six weeks, as lockdown measures began to bite across the nation.

The gloom in the world's largest economy found its parallel across the Atlantic, where experts warned of an unprecedented financial catastrophe in Europe.

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