A bomb threat at Rockville’s Robert Frost Middle School turned into a sun-soaked nightmare when a failed evacuation plan left students stranded outside for two hours.

Of the 1,300 students and staff baking in the 90-degree heat, 24 required treatment “on-site by emergency medical technicians for various heat-related illnesses,” according to a letter sent to parents. No one was taken to the hospital, the letter said.

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