It is unlawful for any person to obstruct, impede or interfere with any officer, agent or employee of the city or with any person who owns or holds any estate or interest in any premises, or any portion thereof, upon which there is a nuisance which has been ordered to be abated, or with any person to whom such premises have been lawfully sold pursuant to the provisions of this chapter, when any such officer, agent, employee, purchaser or person having an interest or estate in such premises is engaged in abating a nuisance or immediate hazard thereon, or in performing any necessary act preliminary to or incidental to such work, or authorized or directed pursuant thereto. (Ord. 2812, 2015)