Four educators in Florida's second largest school district have died from COVID-19 within a day of each other.
Teachers union officials say three teachers and a teaching assistant died between Tuesday and Wednesday in Broward County.
The deaths come as a fierce debate rages across the US over what virus protocols should exist in schools when the academic year begins.
Florida's Republican governor has threatened to withhold pay from school leaders who require masks for pupils.
The highly contagious Delta variant is spreading across a majority of the US.
Broward County students are preparing to return to classrooms next week.
The district is the sixth biggest in the country, with over 272,000 pupils.
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