disperse an unlawful assembly without the instruction of a Magistrate, Government Agent of the district, or any police officer not below the rank of SP, only in instances where the persons mentioned above cannot be communicated with. In such an instance, any commissioned officer of the tri-forces may disperse the unlawful assembly and arrest or confine any person for that purpose. However, when communication with these persons becomes practicable, the tri-forces shall obey the instructions of the Magistrate, Government Agent of the district, or any police officer not below the rank of SP. In this sense, the officers of the tri-forces obey the instructions of the police officer not below the rank of SP when communication is re-established. 4. The participation of the tri-forces shall be subject to the instruction of the police, except in the following instances, 4.1.When emergency law is in effect, as a result of the decision of the President of the Democratic Socialist Republic of Sri Lanka for the maintenance of public order, by section 2 of the Public Security Ordinance (although it is still recommended that crowd control be carried out in this instance in communication and coordination with the police) 4.2.Where the President, by Order published in the Gazette, calls upon the tri-forces for the maintenance of public order in the area where he believes circumstances endangering public security have arisen or are imminent, by virtue of section 12 of the Public Security Ordinance. 5. When the tri-forces participate in crowd control of civilian protests, a strong chain of command must be established for the tri-forces, in accordance with a unique Security Plan created to suit the circumstances of a particular protest. It is the Security Plan that is supreme in determining the chain of command, and measures of crowd control to be employed (an example of such a chain of command in military assistance to civil authorities is detailed in Annexure 2 below). 6. To strengthen the chain of command within the army, navy, and air force; and facilitate better coordination with the police when carrying out crowd control. 29