Whenever, in the judgment of the Mayor or the Chief of Police, it has been determined that an emergency exists as a result of mob action, a riot, an unlawful assembly or persons using force or violence or where there is an imminent and present danger that there will be force or violence used by an unlawful mob, the Mayor or the Chief of Police shall have the power to impose, by proclamation, any and all of the following regulations necessary to preserve the peace and order of the borough:
A.
To impose a curfew upon all or any portion of the borough, thereby requiring all persons in such designated curfew areas to forthwith remove themselves from the public streets, alleys, parks or other public places; provided, however, that physicians, nurses and ambulance operators performing medical services, utility personnel maintaining essential public services, firemen and borough-authorized or -requested law enforcement officers and personnel may be excepted from such curfew.
B.
To order the closing of any establishment within the borough for the period of the emergency, such businesses to include but not be limited to those selling intoxicating liquors, gasoline or firearms.
C.
To designate any public street, thoroughfare or vehicle parking areas closed to motor vehicles and pedestrian traffic.
D.
To call up regular and auxiliary law enforcement agencies within or without the borough to assist in preserving and keeping the peace within the borough.