The s-wave meson-baryon interaction in the S = -1, S = 0 and S = -2 sectors is studied by means of coupled channels, using the lowest-order chiral Lagrangian and the N/D method or equivalently the Bethe-Salpeter equation to implement unitarity. This chiral approach leads to the dynamical generation of the Lambda(1405), Lambda(1670) and Sigma(1620) states for S = -1, the N* (1535) for S = 0 and the Xi(1620) for S = -2. We look for poles in the complex plane and extract the couplings of the resonances to the different final states. This allows identifying the Lambda(1405) and the Lambda(1670) resonances with (K) over barN and KXi quasibound states, respectively. Our results are found to be incompatible with the measured properties of the Xi(1690) resonance, thus ruling this state out as the remaining member of this octet of dynamically generated resonances. We therefore assign 1/2(-) for the spin and parity of the Xi(1620) resonance as the S = -2 member of the lowest-lying 1/2(-) octet.