British Prime Minister Johnson asked the northern parts of the country to re-impose partial blockade amid concerns about the second Covid-19 wave.

Hundreds of thousands of people in Greater Manchester, Bradford, Blackburn and other parts of northern England have been banned from gathering indoors with other families since the night of July 30.

The decision came after UK National Health Service (NHS) data showed that nCoV infections had reached "worrisome" levels in areas of Lancashire and Yorkshire, forcing Prime Minister Boris Johnson.

Prime Minister Johnson had previously warned people not to mistake the danger for a disease that has passed, while Downing Street has also warned against the possibility of a nationwide blockade.

Johnson said tough measures are needed to stop the Covid-19 wave a second time.

"The best way to deal with the epidemic is to drastically blockade localities. We need to control it locally to protect the entire United Kingdom," Johnson stressed.

Health Minister Matt Hancock said on the same day that re-imposing blockade measures was undesirable, but nCoV was widespread due to households not complying with the spacing measure.

"We are constantly looking at the latest data on the spread of nCoV. Unfortunately, we are seeing an increase in infection rates in the northern regions," Hancock said.

Covid-19 has appeared in more than 210 countries and territories, causing more than 17.4 million infections and more than 675,000 deaths.