The newly established Fraunhofer Center started operations in January 2022 and combines the expertise of the Fraunhofer Institutes FOKUS (business unit ESPRI), EMI, IOSB and IVI in the field of security research. For its partners and stakeholders in public safety, Fraunhofer SIRIOS builds a research, test and training environment for coupled simulations of complex security scenarios. Research focuses on digital building and infrastructure twins, secure supply networks and infrastructure, collaborative responder systems, virtual situation visualization and efficiency of communication and response.