Never, ever, ever, for any reason answer questions or give a statement to the police, without the advice and presence of an attorney.
This can easily be taken too far. You have a right to not incriminate yourself but when it is a question regarding public safety where incriminating yourself is not an issue the answer is not so clear. Just be aware of it.
Personally my answering of questions after a shoot would be held only to those things immediately visible absent of opinion with the addition of "I was in fear for my life and acted to stop the threat." After that it is lawyer time.