Bill Gertz says the CIA is building a case that the anthrax attacks of 2001 were part of an international terrorist plot, not an angry lone scientist with a grudge: Inside the Ring .

U.S. officials with access to intelligence reports tell us the information showing a terrorist link to the anthrax-filled letters sent by mail in the weeks after the September 11 terrorist attacks is not conclusive. But it is persuasive.

Asked to comment, a U.S. official said, “There is no evidence at this point to suggest a foreign terrorist link or connection. But the matter is still under investigation and we’re not ruling anything out.”