That may be true. But keep in mind the ridiculous policies imposed upon the CIA by clinton in 1996 that severly limits their ability to utilize as informants those who have commited "human rights" violations. No other country restricts its intelligence services to politically correct spying.
As the writer of this article puts it, "This is like telling FBI agents they must infiltrate the Mafia without talking to any mafiosos."
This attack involved probably hundreds of people in planning, training and financing. clinton's policy may have kept our intelligence from getting wind of it.