  By extending previous analysis of the authors, a systematic study of the
singularity structure and possible asymptotic behaviors of five-dimensional
braneworld solutions is performed in the case where the bulk is a mixture of an
analog of perfect fluid (with a density and pressure depending on the extra
coordinate) and a massless scalar field. The two bulk components interact by
exchanging energy so that the total energy is conserved. In a particular range
of the interaction parameters, we find flat brane general solutions avoiding
the singularity at finite distance from the brane, in the same region of the
equation of state constant parameter $\gamma=P/\rho$ that we found previously
in the absence of the bulk scalar field $(-1<\gamma<-1/2)$.
