  In this paper we consider the collision of black holes with parallel spins
using first order perturbation theory of rotating black holes (Teukolsky
formalism). The black holes are assumed to be close to each other, initially
non boosted and spinning slowly. We estimate the properties of the
gravitational radiation released from such an collision. The same problem was
studied recently by Gleiser {\em et al.} in the context of the Zerilli
perturbation formalism and our results for waveforms, energy and angular
momentum radiated agree very well with the results presented in that work.
