Leeds could be the next city to be plunged back into lockdown after coronavirus cases trebled in just a week.
Infection rates in the city have rocketed from 4.1 cases per 100,000 last week to 13.3 yesterday, the Sun reported.
The huge spike has fuelled warnings that another lockdown will be reimposed.
Boris has already made it clear that authorities will be quick to bring in so called “local lockdowns”.
Parts of Manchester and Yorkshire are already under restrictions again – with households not able to meet up indoors.
Council chiefs in Leeds have urged residents to follow social distancing measures in a desperate attempt to curb the spread.
But the council admitted further steps may be needed.
A statement said: “Measures will be continually monitored over the coming days and further steps may need to be considered in light of new data and information.”
The warning comes weeks after Leeds United supporters celebrated the club’s Championship title win on July 23.
Councillor Judith Blake, leader of Leeds City Council and chair of the Leeds Outbreak Control Board, said they are doing everything they can to keep the community safe.
She told the Sun: "There has been some excellent work across Leeds these past few months which, together with a tremendous sense of community spirit, has ensured we have stayed ahead of the virus.
"With some restrictions now being relaxed, it’s more important than ever that we keep doing everything we can collectively and individually to take care of ourselves, our communities and our city.
"Our outbreak planning has meant we've been able to identify these clusters early and intervene quickly, so it's our hope that by working closely with people living in these areas, we can manage and contain these cases and prevent a wider outbreak.
"But we can’t do that alone and it's absolutely imperative that residents play their part."
Yesterday more towns were revealed as being in danger of being plunged back into lockdown as cases around the country start to creep up.
Preston, in Lancashire, is teetering on the edge of joining the cities in having shops and pubs closed again.
Weekly statistics showed the number of new Covid-19 cases per 100,000 people went up from 15.5 to 33.8.
The city of Preston is to the north of the Greater Manchester lockdown area and to the west of Blackburn with Darwen.
Lancashire's director of public health Dr Sakthi Karunanithi has already warned that Preston may have restrictions imposed within the "next few days".
He told BBC Radio Lancashire: "That is my personal and professional opinion given the statistics, the direction of travel and given the size of the issue."
It follows reports a nightclub in the town became the first in the country to open its doors to revellers in spite of Government guidance.
Punters flocked to Switch nightclub as many in Preston residents branded the decision to reopen "reckless".
And there are other spots which have seen worrying increases.
Swindon, in Wiltshire, has had its figure surge from 19.8 to 48.6.
And Melton in Leicestershire, has increased from 15.5 to 33.
Carlisle in Cumbria is also experiencing a spike, with figures showing a rise from 12.9 to 23.1.
Laws enforcing lockdown restrictions are already in place in areas of the north of England including Manchester, parts of east Lancashire and West Yorkshire.
In Manchester, Tameside and Oldham infection rates for the week to Thursday July 30 as showing cases per 100,000 people still rising in every part of the affect Greater Manchester area.
Parts of Lancashire and Yorkshire were also targeted with Covid-19 restrictions, forbidding people from different households from meeting each other inside their homes or in gardens.