Sadiq Khan has sounded a warning to Londoners, saying the introduction of new lockdown restrictions is "increasingly likely".
Such a move may be given the green light within days and new strict measures cannot be ruled out, the Health Secretary Matt Hancock added.
He said he had spoken with the London Mayor over the weekend about what action is needed in the capital. Mr Khan fears that lockdown restrictions will soon be needed to slow the spread of coronavirus as cases continue to rise.
He will meet council leaders on Monday to discuss measures - with another lockdown now said to be under serious consideration in the days ahead.
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