For purposes of this subpart, emergency conditions:
Shall commence:
At the time of an armed attack upon the United States, or its territories or possessions;
At the time the Commission is officially notified of the likelihood or imminence of such an attack; or
At a time specified by the authority of the President; or
At such time that the Commission's Continuity of Operations Plan is activated; and
Shall continue until the Commission is officially notified of the end of such conditions.