Thunderflashes, smoke generators, and fire simulators were used to simulate the explosion and 500 simulated casualties were deployed to test emergency rescuers at the scene. These mock casualties carried tags to provide paramedics information on the extent of their injuries and this includes injuries related to bomb blasts, such as open wounds and burns. There were also some with injuries related to chemical agents. Dummy mannequins were also used to simulate casualties. 7 hospitals and 2 polyclinics were also involved in the drill as they received the mock casualties. In two hospitals, Singapore General Hospital and Tan Tock Seng Hospital, healthcare workers donned decontamination suits as they prepared to treat victims of chemical agents suspected to be sarin gas.