  We study massless Duffin-Kemmer-Petiau (DKP) fields in the context of
Einstein-Cartan gravitation theory, interacting via minimal coupling procedure.
In the case of an identically vanishing torsion (Riemannian space-times) we
show that there exists local gauge symmetries which reproduce the usual gauge
symmetries for the massless scalar and electromagnetic fields. On the other
hand, similarly to what happens with the Maxwell theory, a non-vanishing
torsion, in general, breaks the usual U(1) local gauge symmetry of the
electromagnetic field or, in a different point of view, impose conditions on
the torsion.
