We present a study of three-particle correlations among a trigger particle and two associated particles in Au + Au collisions at $sqrt{s_{NN}}$ = 200 GeV using a multi-phase transport model (AMPT) with both partonic and hadronic interactions. We found that three-particle correlation densities in different angular directions with respect to the triggered particle (`center, `cone, `deflected, `near and `near-away) increase with the number of participants. The ratio of `deflected to `cone density approaches to 1.0 with the increasing of number of participants, which indicates that partonic Mach-like shock waves can be produced by strong parton cascades in central Au+Au collisions.
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