Police and government warn they will clamp down if mass gatherings continue in UK's hot summer weather.
"Huge sense of pent-up frustration" among British public after lockdown, WHO special envoy says.
US records all-time daily high of 40,000 infections on Thursday, figures from Johns Hopkins University show.
Texas and Florida are among states to pause reopening plans.
20 million people in the US may actually have been infected, almost 10 times the recorded number, health officials warn.
Intu, company which owns the Trafford Centre in Manchester and 16 other UK shopping centres, has gone into administration.
Mexico has now recorded 25,000 deaths and 200,000 cases of the new coronavirus.
The number of cases worldwide stands at 9.6 million with more than 490,000 deaths - Johns Hopkins.
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