The United States would shoot down a North Korean missile if it threatened U.S. territory or that of its allies, Defense Secretary Ash Carter said Sunday.

Carter made the remarks after North Korea stepped up rhetoric indicating the likelihood of an intercontinental ballistic missile launch, with Pyongyang reportedly saying the same day it could take place at any time and location determined by the leadership.

In an NBC interview, Carter described Pyongyang's nuclear weapons and ballistic missile programs as a "serious threat" to the United States.