As secretary of state, Henry Kissinger canceled a U.S. warning against carrying out international political assassinations that was to have gone to Chile and two neighboring nations just days before a former ambassador was killed by Chilean agents on Washington's Embassy Row in 1976, a newly released State Department cable shows.

Whether Kissinger played a role in blocking the delivery of the warning against assassination to the governments of Chile, Argentina and Uruguay has long been a topic of controversy. Discovered in recent weeks by the National Security Archive, a non-profit research organization, the Sept. 16, 1976 cable is among tens of thousands of declassified State Department documents recently made available to the public.

"The Sept. 16 cable is the missing piece of the historical puzzle on Kissinger's role in the action, and inaction, of the U.S. government after learning of Condor assassination plots," Peter Kornbluh, the National Security Archive's senior analyst on Chile, said Saturday. Kornbluh is the author of "The Pinochet File: A Declassified Dossier on Atrocity and Accountability."

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