It is unlawful for any person to interfere with any police or fire official, or other public officer or employee when engaged in the performance of official duty, or to permit or assemble for the purpose of committing any act which would interfere with such officials and persons in the performance of their duty or under their direction. (Ord. 1244 § 2 (part), 1985: Ord. 506 § 7, 1969).