Abstract: Large-scale safety and security incidents typically require the coordinated effort of multiple organisations. A networked organisation is generally seen as the most appropriate structure for coordination within safety and security collaborations. Such networks generally are mixed-sector networks in the sense that the strategic orientations of the contributing organisations differ. Our research focuses on how to prevent, overcome and cope with the tensions resulting from this mixed-sector nature. We studied cases of three major Dutch events and our preliminarily findings were that an active network governance approach contributes to a more decisive and more purposive organisation. The flexibility and decisiveness of the networked organisation can be enhanced if in addition informal network governance measures are applied. Moreover, a purposive information infrastructure, directed towards a limited number of clear priority issues, is a key enabler of the functioning of the network.