From Knoxville, Tenn.: A middle school evacuation due to a bomb threat resulted in at least 21 students being hospitalized with heat illness. Three of the students are in critical condition. The evacuation occurred after a student reported a written threat. The entire student body was moved to a nearby football field, where they spent time outside in sweltering heat.

The heat appears to have contributed to the students' illnesses, as the area is under a heat advisory with temperatures in the mid to upper 90s. Authorities confirmed the school reacted as it should to the bomb threat.

Further details about the incident are available from the source, including statements from authorities and information about the school's response to the threat.