Mask mandates creep back into schools for summer sessions

Mask mandates are making a comeback in a handful of school districts across the country, even as the school year wraps up and districts shift to summer school.

At least a dozen school districts in some of the most populated cities in the country still mandate masks in schools. In several instances, the districts had removed mask mandates but then elected to reinstate them, citing rising COVID-19 cases in the area.

The number of school districts requiring masks between May 6 and June 10 ticked up from nine to 13, according to the data...