The development of multi-synchronous decision support systems to facilitate collaboration between diverse users is an emerging field in emergency management. Traditionally, information management for emergency response has been a centralised effort. However, modern devices such as smartphones provide new methods for gaining real-time information about a disaster from users in the field. In this paper, we present a framework for multi-synchronous collaborative report writing in the scope of emergency management. This framework supports desktop-based users as information providers and consumers, alongside mobile users as information providers to facilitate multi-synchronous collaboration. We consider the benefits of our framework for writing collaborative Situation Reports and discuss future directions for research.