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Syrians look down at a poster of Syrian President Bashar al-Assad (L) and his late father and predecessor Hafez al-Assad in Damascus, as they watch the tourist train pass following the re-opening ceremony of the rail route between two neighbourhoods in the Syrian capital, Raboeh and Dumar, on May 1, 2015. AFP PHOTO / LOUAI BESHARA        (Photo credit should read LOUAI BESHARA/AFP/Getty Images)
Syrians look down at a poster of Syrian President Bashar al-Assad (L) and his late father and predecessor Hafez al-Assad in Damascus, as they watch the tourist train pass following the re-opening ceremony of the rail route between two neighbourhoods in the Syrian capital, Raboeh and Dumar, on May 1, 2015. AFP PHOTO / LOUAI BESHARA        (Photo credit should read LOUAI BESHARA/AFP/Getty Images)

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Why Syrian President would gas his own people

As the Syrian Civil War rages on, civilians once again find themselves the victims of chemical weapons used by President Bashar al-Assad. CNN's Nick Paton Walsh reports.

Why Syrian President would gas his own people

As the Syrian Civil War rages on, civilians once again find themselves the victims of chemical weapons used by President Bashar al-Assad. CNN's Nick Paton Walsh reports.