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Distributed systems like crisis management are subject to the dissemination of a huge volume of heterogeneous events, ranging from low level network data to high level crisis management intelligence, depending on the role of the rescue teams involved. In such systems, Complex Event Processing (CEP) has emerged as a solution to detect and react (in real-time) to complex events, which are correlations of more primitive events. Although various CEP engines implement the support for dealing with the business heterogeneity of events, the technological integration of these events remains uncovered. Therefore, in this paper we introduce DiCEPE (Distributed Complex Event Processing Engine), a platform which focuses on the integration of CEP engines in distributed systems. DiCEPE provides a native support for various communication protocols in order to federate CEP engines and ease the deployment of complex systems-of-systems. We illustrate our proposal using a nuclear crisis management scenario and show how DiCEPE leverages the coordination and the federation of different CEP engines.