The same way they got their hands on other weapons,via proxies of US, Israel, Turkey and those providing arms to the rebels. Critical thinking exercise: Is Assad really going to use chemical weapons as soon as he is told that it is a red line for the US that would cause it to re-think its reluctance to arm the rebels?
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Palestinian reports: One seriously injured by rubber bullet during clashes near Ramallah (Haaretz)
from the article: U.S. looking into allegations of chemical weapons use in Syria