The Governor, when in his opinion the facts warrant, shall, by proclamation, declare that, because of unlawful assemblage, violence or threats of violence, a danger exists to the person or property of any citizen and that the peace and tranquility of the State, or any political subdivision thereof, or any particular area of the State designated by him, is threatened, and because thereof an emergency, with reference to such threats and danger, exists.

The Governor, upon the issuance of a proclamation as provided for in this section, shall forthwith file such proclamation in the office of the Secretary of State, which proclamation shall be effective upon issuance and remain in full force and effect until revoked by the Governor.