  We report an analysis of charmless hadronic decays of neutral B mesons to the
final state KsK+/-pi-/+, using a data sample of (465 +/- 5) x 10^6 BB-bar
events collected with the BABAR detector at the Y(4S) resonance. We observe an
excess of signal events with a significance of 5.2 standard deviations
including systematic uncertainties and measure the branching fraction to be
BF(B0 --> KsK+/-pi-/+) = (3.2 +/- 0.5 +/- 0.3) x 10^-6, where the uncertainties
are statistical and systematic, respectively.
