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A Syrian rebel tries on a gas mask seized from a Syrian army factory in the northwestern province of Idlib on July 18, 2013. Western countries say they have handed over evidence to the UN that Bashar al-Assad's forces have used chemical arms in the two-year conflict. More than 100,000 people have died in the conflict, which morphed from a popular movement for change into an insurgency after the regime unleashed a brutal crackdown on dissent. AFP PHOTO/DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
A Syrian rebel tries on a gas mask seized from a Syrian army factory in the northwestern province of Idlib on July 18, 2013. Western countries say they have handed over evidence to the UN that Bashar al-Assad's forces have used chemical arms in the two-year conflict. More than 100,000 people have died in the conflict, which morphed from a popular movement for change into an insurgency after the regime unleashed a brutal crackdown on dissent. AFP PHOTO/DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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    UN: Syria's chemical use 'unacceptable'

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UN: Syria's chemical use 'unacceptable'

U.N.-Arab League special envoy Lakhdar Brahimi condemns Syria's use of chemical weapons at a news conference in Geneva.

UN: Syria's chemical use 'unacceptable'

U.N.-Arab League special envoy Lakhdar Brahimi condemns Syria's use of chemical weapons at a news conference in Geneva.