Western intelligence agencies observed Syrian units making advanced preparations for the potential use of chemical weapons, including loading trucks with ready-to-use bombs and shells, prompting President Obama last week to warn Syria against using the banned munitions, according to Western and Middle Eastern officials.

Soldiers at one Syrian base were monitored mixing precursors for chemical weapons and taking other steps to ready the lethal munitions for battlefield use, the officials said. It was the first hard evidence that Syria was moving toward possible activation of its vast arsenal of chemical weapons, which includes nerve gas and other poisons.
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