On Aug. 21, 2013, filmmaker Humam Husari woke up to one of the most horrific attacks of the Syrian civil war.

The rebel-held region of Ghouta outside Damascus, Syria, was hit by rockets containing sarin gas, a deadly chemical generally considered to be a weapon of mass destruction.

The number of casualties is still uncertain according to the United Nations, but estimates range from 281 to around 1,400 casualties with 3,000 wounded.

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