An armored vehicle on a training mission overturned at an Air Force unit in the southwestern city of Gunsan on Thursday, leaving the vehicle's driver unconscious and another soldier injured, the Air Force said.

During the accident, which took place around 10:50 a.m., the K20 armored vehicle carrying four soldiers was traveling down a road near a magazine inside the 38th Fighter Wing base in the city on South Korea's west coast. The driver, a corporal, was taken to a nearby hospital in a coma due to brain damage from the accident and a sergeant sustained an injury to his leg. The two other soldiers escaped from the vehicle safely, according to the Air Force. 

The military vehicle is believed to have failed to navigate a steep curve and lost its balance. The Air Force unit is looking into what caused the accident. (Yonhap)