Bush administration officials have accused Syria of harboring people linked to Saddam Hussein's regime and developing chemical weapons.

CNN: Lawmaker: Syria vows not to harbor wanted Iraqis

The UNODA estimates that by the 1970s and '80s, 25 states were developing chemical weapons capabilities, and that since the end of the First World War, such munitions have caused more than 1 million casualties globally.

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While various administration figures, including President Bush, have in recent days warned Syria about harboring senior members of the Iraqi leadership and of developing chemical weapons, Pentagon officials brushed aside questions about any possible military action against Syria.

CNN: Pentagon: 'Major combat' over, but smaller fights remain