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We present new broad-band optical and near-infrared CCD imaging together withdeep optical intermediate-resolution spectroscopy of Mkn 1087 and itssurrounding objects. We analyze the morphology and colors of the stellarpopulations of the brightest objects, some of them star-formation areas, aswell as the kinematics, physical conditions and chemical composition of theionized gas associated with them. Mkn 1087 does not host an Active GalacticNucleus, but it could be a Luminous Compact Blue Galaxy. Although it wasclassified as a suspected Wolf-Rayet galaxy, we do not detect the spectralfeatures of these sort of massive stars. Mkn 1087 shows morphological andkinematical features that can be explained assuming that it is in interactionwith two nearby galaxies: the bright KPG 103a and a dwarf ($M_B\sim-18$)star-forming companion. We argue that this dwarf companion is not a tidalobject but an external galaxy because of its low metallicity [12+log(O/H) =8.24] with respect to the one derived for Mkn 1087 [12+log(O/H) = 8.57] and itskinematics. Some of the non-stellar objects surrounding Mkn 1087 are connectedby bridges of matter with the main body, host star-formation events and showsimilar abundances despite their different angular distances. These facts,together their kinematics, suggest that they are tidal dwarf galaxies formedfrom material stripped from Mkn 1087. A bright star-forming region at the southof Mkn 1087 (knot #7) does not show indications of being a tidal galaxy or theproduct of a merging process as suggested in previous works. We argue that Mkn1087 and its surroundings should be considered a group of galaxies.Comment: Accepted by A&A, 21 pages, 13 figures, 8 table

The tidally disturbed luminous compact blue galaxy Mkn 1087 and its surroundings