A person commits the Class A offense of obstructing a fireman when, by using or threatening to use violence, force, or physical interference, or obstacle, he knowingly obstructs, impairs, or hinders the prevention, control, or abatement of fire by a firefighter, acting under color of his official authority. (Ord. 200 §1, 1982; Amended Ord. 472 §10, 2003; Amended Ord. 623 §1, 2010)