An Illinois National Guardsman training at Mississippi’s Camp Shelby died Friday after completing a two-mile run as part of a fitness test, according to a release from the Mississippi Army National Guard.

The soldier experienced a medical emergency Friday after completing the run, with the National Guard saying he experienced “symptoms associated with heat-related injuries.” Medics provided immediate assistance before the soldier was transported to Forrest General Hospital in nearby Hattiesburg, where he was pronounced dead shortly after arrival.

Temperatures in the Hattiesburg area, as with much of the Deep South, soared into the 100s Friday and Saturday, with heat indices at times exceeding 110 degrees.

Additionally, a second soldier at Camp Shelby was taken to the hospital after experiencing similar symptoms during a training exercise Saturday, the National Guard said.

The soldier was given immediate assistance, taken to a shaded area and given plenty of water, but when his condition worsened, he was taken to the hospital, the release said. He was still receiving care as of Monday afternoon.

After the second incident, the Mississippi National Guard issued a Safety Stand-Down order which called a halt to all outdoor training activities from 7 a.m. to 8 p.m. daily, until further notice.