HACKENSACK, NJ -- Today was the first day of school for most children in Hackensack, and unfortunately, it will be one several students and their families will likely hope to forget. Five students at Bergen Arts and Science Charter High School in Hackensack experienced heat exhaustion and three were hospitalized.

According to NJNews12, the students were outside for gym class during the hottest part of the day. First, one student was treated for heat exhaustion by the school nurse and then treated at a local hospital. Within an hour of the first student falling ill, three more displayed symptoms of heat exhaustion. It is not clear yet whether the physical education students stayed outside once the first student fell ill. 

In a statement to the media, the school said physical education classes had been modified due to the weather and students were told to stay in the shade, though classes were still held outside, where temperatures exceeded 90 degrees Fahrenheit this afternoon. With humidity over 50%, that feels like 100 degrees. 

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Heat exhaustion can occur even when drinking plenty of water.  Symptoms generally include weakness, headache, loss of consciousness, muscle or abdominal cramps, vomiting and nausea. 

This is a breaking news story and additional information will be added once available.