A need to develop effective crime prevention strategies has been recognised throughout history. Due to the financial constraints of criminal justice systems, there are major global efforts to ensure that the strategies employed are highly cost-effective, rational, and evidence-based. To aid such efforts, this study explores the impact of a collaborative, community-oriented crime prevention initiative in Colombia. Empirically, it is based on pre- and post-intervention views of police officers and citizens (assessed by questionnaires) in areas covered by the initiative and control areas, complemented with focus group interviews and crime statistics. The police officers appreciated the greater autonomy provided by the approach and associated changes in organisational culture. The citizens had substantial trust in the police, despite high perceptions of general disorder and personal fear of crime. The preliminary findings indicate that the approach has had some promising effects, but several aspects require more attention.