The reactions K- d --> pi(-) X+, K- 3He --> pi(+) n X-0, and K- 3He --> pi(+) p X- at 0.87 GeV/c were studied using missing mass magnetic spectrometer. The X stands for a two-baryon, strangeness -1 resonant system. In order to enhance p-wave production of a dibaryon state all reactions were studied st large scattering angles; 10 degrees to 26 degrees for deuterium target, and 20 degrees for He-3 one. After known backgrounds were reproduced an excess of events is observed in all three reactions. The mass distribution and the final state particles associated with the excess events suggest compatibility of these events with expectations for two-baryon resonant state decays.