We present preliminary results of the STAR experiment at RHIC on exotic particle searches in minimum bias Au+Au collisions at (~SNN)~(1/2) = 200 GeV. We observe a narrow peak at 1734 ± 0.5 ± 5 MeV in the ΛK_s~0 invariant mass with width consistent with the experimental resolution of about 6 MeV within the errors. The statistical significance can be quantified between 3 and 6 σ depending on cuts and methods. If this peak corresponds to a real particle state it would be a candidate for the N~0 or the Ξ~0 I = 1/2 pentaquark states.
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