ATLANTA (AP/WAOK) – Atlanta’s fire department is suspending some of its training after some recruits were overcome by heat during training exercises.

Authorities say three recruits were sent to Atlanta Medical Center on Monday, during the first day of training with self-contained breathing apparatus.

Atlanta Fire Chief Kelvin Cochran says that one of the recruits suffered a heat stroke, while the other two had heat exhaustion.

Two of the recruits remained in the hospital Tuesday evening. Authorities say the one who suffered heat stroke is recovering and is now breathing without a ventilator.

Fire officials say they want to know more about what caused the illnesses before training resumes.