Well the cops do say "black male suspect", and at that point the cops only look for black males to find their suspect. It's not racial profiling; it's just common sense.

The difference between this and racial profiling is more in how it's determined and in how it's used.

When a cops sees a ``black male'' running out of a building with a smashed window, he has reasonable suspicions that that man had something to do with a crime. In the case of harassing Arabs living in the US, it would be more along the lines of rounding up all the rednecks in the US because Tim McVeigh blew up a building. They almost definitively didn't have anything to do with a crime, and there's absolutely no evidence that they did.

Secondly, a report of a ``black male suspect'' causes a cop to be on the lookout for someone looking suspicious that is black. This narrows the field of inquiry, as if he sees a white or asian guy, he can be pretty sure it's not the person he's looking for. In the case of Arab racial profiling, suddenly anyone who is Arabic becomes a suspect, instead of anyone who's not being dismissed (which, as number6 pointed out, wouldn't even be correct in this case).