What is your source for that piece of disinformation?
Bill Casey, Cap Weinberger, subsequent CIA chiefs. It used to be common knowledge. This is the first source I Googled. If you don't like The Guardian (they used to be far left) there are many more:
http://www.theguardian.com/world/1999/jan/12/julianborger1
It was 30 years ago and not this regime. But, it appears to be a fact.