A North Korean soldier has defected to South Korea by crossing the Joint Security Area at the truce village of Panmunjeom. 

South Korea's Joint Chiefs of Staff(JCS) said the soldier was shot by North Korean troops as he fled across the Military Demarcation Line from the northern side of Panmunjeom at 3:31 p.m. Monday. 

The JCS said the North Korean soldier suffered heavy injuries to his elbow and shoulder. The unidentified North Korean, who is an enlisted soldier, was flown by a UN Command helicopter to a South Korean hospital for treatment. It said there was no exchange of gunfire between South and North Korea. 

The JCS said the unarmed soldier was lying bleeding about 50 meters south of the Military Demarcation Line before the South Korean military took custody of him.  There's no word yet on whether his injuries are life-threatening. The JCS said several gunshots were heard when the soldier ran across the border. 

The South Korean military has raised its alert level in anticipation of a possible North Korean provocation following the defection.