In a significant step forward for the ATLAS project, the United Nations Interregional Crime and Justice Research Institute (UNICRI) has successfully concluded the first train-the-trainers event held in Tunis, Tunisia, from 11 to 15 September 2023. The event, which was a key milestone of the ATLAS project, aimed to strengthen Tunisia's capacity to prevent chemical weapons attacks by non-state actors through enhanced intelligence-sharing and inter-agency cooperation mechanisms.