Just 15% of care home staff have been tested at any time since the outbreak.
Police reported no serious injuries.
Mary Bousted, of the National Education Union, said schools should not be reopening on Monday.
Footage has emerged of standstill traffic this weekend.
Detectives have concluded there is no evidence to substantiate any criminal offences having taken place over the death of Belly Mujinga, said BTP.
The South Yorkshire authority has cited fears that the test and trace system will not be ‘robust enough’ by next week.
Care England chief executive Professor Martin Green said testing in care homes needs to be prioritised.
Ministers on whopping salaries expect keyworkers to self-isolate on £95 a week says GMB Union
It comes after days of unrest which were sparked by video footage of a black man dying after a white police officer knelt on his throat.
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