Penal Code Section 154

154. Whenever any unlawful assembly or riot takes place, the owner or occupier of the land upon which such unlawful assembly is held or such riot is committed, and any person having or claiming an interest in such land, shall be punishable with fine not exceeding two thousand ringgit, if he or his agent or manager, knowing that such offence is being or has been committed, or having reason to believe it is likely to be committed, do not give the earliest notice thereof, in his or their power to the principal officer at the nearest police station, and do not, in the case of his or their having reason to believe that it is about to be committed, use all lawful means in his or their power to prevent it, and in the event of its taking place, do not use all lawful means in his or their power to disperse or suppress the riot of unlawful assembly.