On Sunday, September 6, 2015, a forestry technician (hot shot) had physical training. After the training, the hot shot felt more tired than usual for a few days. On September 9, 2015, the hot shot had his left knee examined for a previous injury. During the exam, the physician noticed swelling in the arms and recommended blood work. The blood work indicated a muscle injury due to physical training in hot conditions and the hot shot was admitted to the hospital for treatment in the morning on September 10, 2015.