Reports by citizens are a great source of information for the police. Local residents often know well what is going on in their neighborhood and which situations are suspicious. In this study, an online survey was conducted to investigate what drives citizens to report to the police. A wide range of individual, social and institutional drivers were explored. The results show that the more often people have reported anything to the police in the past, the higher their risk perception, self-efficacy, citizen participation and police legitimacy. Furthermore, participants with a higher degree of self-efficacy, response efficacy, trust in the police and police legitimacy appeared to be more willing to report in the future. An open question regarding what motivates people the most to report show that response efficacy (the idea to what extent reporting has an effect on increasing safety and reducing crime) and altruistic values (justice, to help society and punish the perpetrators) were mentioned most frequently.