The origin of the main excitation mechanisms in LINER (Low Ionization Emission Line Region) nuclei are still controversial, with nonstellar photoionization, fast shocks or hot stars as the principal candidates. In the AGN scenario, LINERs could represent the link between more powerful AGN and normal galaxies as suggested by their low X-ray luminosities. Their interest increases as they would be the dominant population of active galaxies in the nearby universe. Ou work in X-rays have contributed to confirm that a large number of nuclear LINERs may be AGN powered. They also seem to follow other relations found for AGN, towards lower luminosities, both considering the properties of their MIR continuum and extended Halpha emission at high spatial resolution.