Twelve Putnam County middle school students have been released from the hospital Thursday afternoon after reports that they suffered from heat exhaustion earlier in the day.

Kirk Collier with Putnam County Schools said a field day event was taking place at George C. Miller Middle School, located at 101 S. Prospect St. in Crescent City. Collier said they showed symptoms of weakness and vomiting.

Eleven students were transported to the hospital by ambulance and one was transported by a parent, but were later released.

The school district says it's investigating the incident.