Claims were made at the time. I can't remember who it was right off the top of my head, but I recall seeing information about this several times. IIRC, the FBI initially mentioned a couple of groups claiming responsibility, then... nothing...
From what I've read of this incident, it was a missile.
The Bush administration covered up all the clinton's crimes.
Your tagline is especially appropriate, given your support of a moonbat theory like this.