It would be nice if they would release some details on the bike and rider (whatever descriptions they have) because many here myself included would be glad to help identify the culprit (if we can).
I had hoped they already knew who he was but I am starting to doubt that now...
SIU isn't so much worried about who was driving the motorcycle or what kind it is etc. They are investigating if there was any criminal offence committed by the police officer.
The police are investigating the actual incident.