"Military communication lines and the hotline in Panmunjom will be disabled when the South's staff has been deported," the committee said in a statement published by state news agency KCNA.
Seoul said Wednesday it was suspending cooperation with Pyongyang following the Sunday launch of a long-range rocket in the North, allegedly to put a satellite into orbit. The West suspects this was a ballistic missile test. It followed a nuclear bomb test last month.
On Thursday, South Korean companies were ordered to pull out of the Kaesong industrial park on the border between two Koreas. The move reportedly aims to sever financial flows to the North, which it allegedly uses to develop nuclear and missile technologies.
Despite limited industrial cooperation, South and North Korea are still legally at war as no peace treaty between them was signed after the Korean War of 1950-1953.