During field training, Recruit Officer Washington is assisting at the scene of an explosion. She has been assigned to crowd control while firefighters and emergency medical personnel are at work. Several persons try to move forward past the perimeter line she has established and must maintain. When she asks them to step back, they say that as citizens, it is their duty to help in civic emergencies. Which one of the following things would be best for her to say to avoid problems?

Problem Sensitivity: This ability involves being able to tell when something is wrong or is likely to go wrong. It includes being able to identify the whole problem as well as elements of the problem.