  A narrow peak near 1870 MeV is observed in the combined invariant-mass
spectrum of the systems $\Lambda K^0_S \pi^-$, $\Lambda K^0_S \pi^+$, $\Lambda
K^- \pi^-$, and $\Lambda K^- \pi^+$ formed in $\nu_\mu$- and
$\bar{\nu_\mu}$-induced charged-current collisions with free protons,
deuterons, and Neon nuclei. Observed width of the resonance is consistent with
being entirely due to apparatus smearing. A possible interpretation of the peak
is formation and three-body $\Lambda K \pi$ decay of an exotic baryon with $I =
3/2$ and $S = -2$.
