What good does it do to have a description and not release to the public? I would think that giving descriptions on TV would be one of the best ways to catch them.
I'm assuming the police have a tactical reason for it. If the withholding of this information turns out to be because of political correctness there will be a HUGE public backlash. My initial hunch is that it is some whacked out home grown Nut Job but it's things like this which makes me think twice. Stay Tuned.