In rescue operations, situation awareness is very critical to decision-makers and responders in order to reduce the bad consequences. Furthermore, a good collaboration between services and organizations is vital to achieve successful operations. Therefore, a good communication and information exchange between actors is crucial to meet these requirements. This work aims to enhance situation awareness in rescue operations by supporting communication and interaction between participating actors. To do that, we start by studying interactions, communication, and information flow. After that, we look forward to design and implement a communication system that will be used by rescuers and first responders. In this paper, we show our preliminary results in which we model the interactions.