The city chief of police and all police officers of the city shall have and are granted permission to exercise their ordinary duties as peace officers, to prevent intoxication, fights, riots, loud noises, disorderly conduct, obscenity and cause of conduct calculated to disturb the public peace or which are offensive to the public morals within the city and within three miles of the limits thereof. (Ord. 474 § 4(part), 1986; Ord. 7 § 1, 1909)