The United Kingdom is at a perilous moment in the Covid-19 pandemic, Prime Minister Boris Johnson said on Monday, adding that there were oxygen shortages in some places.

"It's a race against time, because we can all see the threat that our NHS faces, the pressure it's under, the demand in intensive care units, the pressure on ventilated beds, even the shortage of oxygen in some places," Johnson said, of the national health service.

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