"The Times' splash reports that secondary school pupils can transmit coronavirus as easily as adults, according to a study by Public Health England (PHE). The scientists, who studied thousands of pupils, believe that tougher rules may be needed for older children - who according to one of the paper's sources - are said to be the "most likely to get infected, have silent infection, transmit infection and get sicker".
This is reported in the Times (behind a paywall), no doubt if there is any substance to it other sources will pick it up, PHE are supposed to be publishing the study soon.