Agree with Steve.
A State trooper friend of mine suggests saying this :
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote
I am the victim. I was in fear of being killed, and I defended myself.I will provide more details after I speak to my attorney.
Then shut up, and use your thumb and forefinger to keep your runaway lips in check
during the mind games that follow to make you talk.
Also, tell the police that you are not feeling well [ you probably will not anyway _ might have been hit/cut etc.], and you want an ambulance. This will buy you time away from the relentless police pressure to make you talk.
As Bram indicates, in the aftermath, you will have a hard time shaking that feeling of "persona non grata"