http://www.laweekly.com/ink/02/37/news-crogan.php
From the L.A. Weekly:
TO DATE, THE FBI AND DEPARTMENT OF Justice have seemingly exerted more effort in shutting down these leads than pursuing them. Last October, the Justice Department blocked the court appearance of retired Oklahoma City FBI agent Dan Vogel at a hearing in the state murder case against convicted Oklahoma City accomplice Terry Nichols. In an interview with the Weekly, Vogel said he intended to tell the court the truth -- that he had accepted evidence from former TV reporter Jayna Davis that tied Timothy McVeigh, Nichols and a group of Iraqis working in Oklahoma City to a larger bombing conspiracy.
Vogel said he passed the materials to the Bureau but was later told the documents were returned because of questions regarding who owned the documents. Davis and her attorneys contend that the documents were never returned. Whatever the case, the Bureau's reputed rationale for spurning potential evidence is slim indeed.