Article 4. In case of a dangerous situation, such as a natural calamity, incident or destruction of a structure, traffic accident, explosion of a dangerous thing, appearance of a mad dog or of a runaway horse, excessive conjestion or the like which threatens to cause an injury on the lives and persons of the people or a serious damage on the properties of them, a police official may give a necessary warning to a person who happens to be on the scene, keeper of the subject thing and any other person concerned with it and in case of especially admitting of no delay, he may check such person or order the person under threatening danger take refuge to the limit required for escaping from the impending danger or order a person who happens to be on on the scene, keeper of the subject thing and any other person concerned with it to take measures generally considered necessary for preventing the danger as well as he may take himself such measures as mentioned above.