Genuine Three-Particle Bose-Einstein Correlations in Hadronic Z Decay

We measure three-particle Bose-Einstein correlations in hadronic Z decay with the L3 detector at LEP. Genuine three-particle Bose-Einstein correlations are observed. By comparing two- and three-particle correlations we find that, in conventional interpretation, the data are consistent with what is expected from fully incoherent pion production. Alternative explanations are, however, not excluded.