Citizens' Behavior During a Crisis Crisis situations of the past (e.g., earthquake in Christchurch and hurricane Katrina in the United States) show that citizens often take action in response to a crisis (Sauer, Catlett, Tosatto, & Kirsch, 2014; Whittaker et al., 2015). Evaluations of citizen behavior during actual crisis generally show that citizens behave adaptively: as far as possible, they start with the search of victims, take care of victims and start with reconstruction (Perry & Lindell, 2003). Grimm, Hulse, Preiss, and Schmidt (2014) found similar results when they interviewed survivors of a range of disasters: collapse of a building, earthquakes, fires, floods and terror attacks. The most frequently mentioned behaviors were supporting each other through the crisis, saving people's lives, preparing for evacuation and seeking information. Clearly, citizens do not passively wait for the emergency services to arrive, but tend to act in what they believe is the best way given their understanding of the situation (Perry & Lindell, 2003). Despite citizens' good intentions to provide help during crisis, several risks are involved when citizens act upon a crisis. Not every individual may be able to provide help in an adequate way due to limited knowledge and skills, and actions may not always be optimal given the situation at hand (Fernandez, Barbera, & Van Dorp, 2006). For example, after the 2007 Hebei Spirit oil spill in South Korea, many helpers were not aware of the toxicity and harmful effects of petroleum, and so they were not properly clothed and later suffered from skin diseases (Hur, 2012). Another example, after the 2001 terrorist attacks of the World Trade Center, is that many volunteers who were at the scene to assist search and rescue operations, were later overwhelmed by the emotional impact of their actions (Whittaker et al., 2015). Taken together, citizens who spontaneous help by spending their time, knowledge, skills and resources during a crisis represent a vital resource for emergency and disaster management. However, this helping behavior may be ineffective and can actually hinder emergency activities by creating health and safety problems for themselves or others if they engage in activities without the right knowledge, equipment, training and skills. Therefore, research suggests that organizations that have to deal with crises have to collaborate with citizens, for example, by providing information that is required to help adequately (Whittaker et al., 2015). Information from Government Citizen participation during a crisis is valuable, so governments and crisis management organizations have to integrate the help of ordinary citizens in mitigation, adaptation, or emergency management and recovery plans (Hoss, Klima, & Fischbeck, 2014). This is necessary to reduce the risk that citizens act upon a crisis in a manner that is not adequate for the specific situation. By providing citizens information before and during a crisis, through risk-and crisis communication, behavior can be guided (Vihal...