Residents are holding a rally against the deployment of the Terminal High Altitude Area Defense (THAAD) system in Seongju in the southeastern part of South Korea.
Massive police forces have been dispatched at the site as clashes broke out.
Protestors blocked the roads near the golf course which has been used for the deployment of THAAD system.
As of now, the casualties are still unknown.
The clash came after South Korea's Ministry of National Defense announced that four more THAAD rocket launchers will be deployed by the US Forces Korea (USFK) on Thursday at their base in Seongju.