Actually, I was about 5 miles away from this when it happened.
There were no US soldiers stationed at or near the police station.
The US had no liasons with the Iraqi police station.
We didn't visit the Iraqi police station.
We didn't provide direct support to the Iraqi police in the normal course of their duties.
The only time any US personnel visted the Iraqi police HQ was to turn over prisoners that we had captured and determined should be handled by local authorities, rather than US authorities.
The US has no direct authority over the Iraqi police, and they act pretty much autonomously.
Finally, seeing that I was stationed there, it seems odd that no one really, ever, talked much about this incident because, well, it was inconsequential when one looked at it. Both before and after it were attacks that involved more total people, more US personnel, and caused more damage.
If one can only predict the least significant events, what use is prediciton? There was nothing special about that day, or that attack..in fact, it was rather unremarkable given the history of the area before and after. Predicting a hot day in the summer is about as impressive.