Seoul (CNN) North Korea's military has threatened to "physically act" against an advanced anti-missile system deployed by the U.S. and South Korea, and make them "suffer from the nightmare extreme uneasiness and terror." The harsh rhetoric by North Korea's People's Army (KPA) is the communist state's first comment on Terminal High Altitude Area Defense (THAAD) since the U.S. and South Korea announced Friday they are in the final stages of negotiation about where to deploy the missile system. THAAD can shoot down short, medium and intermediate ballistic missiles at incredible speed and altitude, and has been used by the U.S. for years to protect its military units.North Korean military said it will "physically act" against THAADTHAAD is an advanced defense system that can intercept ballistic missiles
"There is no reason for us to use _ against or intrude security interests of a third party country besides North Korea," she added.