This paper presents a distributed virtual reality environment for children called EVE-Environnements Virtuels pour Enfants. The virtual environment architecture is reactive agents based. The FCM-like dynamic action planning mechanism assures agent's adaptability to its environment changes. This virtual environment supports cooperation among members of a dispersed team engaged in a concurrent context. By the means of their avatars, special cases of agents, users are allowed to interact and to give decisions using cooperative mechanisms. A user-friendly interface enables teachers to create their own stories that fit with children's pedagogical requirements and generate new virtual environments according to the teacher's specifications. The implementation is based on DeepMatrix as environment server, VRML and Java as languages and Cortona VRML plug-in from ParallelGraphics. It is actually running on the Internet: http://eve.enib.fr