ABC News: U.S. Weapons Inspector Finishes Iraq Work

"After more than 18 months, the WMD investigation and debriefing of the WMD-related detainees has been exhausted," wrote Charles Duelfer, head of the Iraq Survey Group, in an addendum to the final report he issued last fall.

"As matters now stand, the WMD investigation has gone as far as feasible."

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Among unanswered questions, Duelfer said a group formed to investigate whether WMD-related material was shipped out of Iraq before the invasion wasn't able to reach firm conclusions because the security situation limited and later halted their work. Investigators were focusing on transfers from Iraq to Syria.

No information gleaned from questioning Iraqis supported the possibility, one addendum said. The Iraq Survey Group believes "it was unlikely that an official transfer of WMD material from Iraq to Syria took place. However, ISG was unable to rule out unofficial movement of limited WMD-related materials."