SUHAKAM Report of Public Inquiry into the Incidents During and After the Public Assembly of 28 April 2012 42 assembly of 28 April. A briefing was also given on the use of water cannons. The briefing was led by ACP Jamaludin Abd Rahman and assisted by Superintendant Zahari bin Hj Mohd Yusoff (W23). 4.5 According to ACP Jamaludin, water cannon and tear gas would be fired from the FRU’s command vehicle (CV) upon receiving the order from the officer in charge. He added that usually the police would use plain water first followed by chemical-laced water to disperse the crowd.35 The water cannon should be fired at 180 degrees. 4.6 ACP Jamaludin then explained and demonstrated the use of tear gas. Before the firing of tear gas, a bell would be rung as a signal for the troops to stand by. Then, the yellow flag would be raised as a signal for the troops to start firing the tear gas. The officer in charge would direct the angle at which the tear gas was to be fired, that is, whether: Upwards (45 degrees) – canister dropping range is 100m to 150m Straight (90 degrees) – canister dropping range is 75m to 100m Downwards (45 degrees) – canister dropping range is 20m to 30m. ID 17 (g): Demonstration by the FRU on the use off tear gas guns from an upward angle (45 degrees) 35 According to ACP Jamaludin, the quantity of chemical substance is 1 %.