Hundreds of Syrians, many of them children, were the victims of an unconscionable chemical attack — carried out by their own government — on April 4, 2017.

The attack was orchestrated under Syrian President Bashar al-Assad, according to U.S. officials, and has killed at least 70 people and injured hundreds more in the northern rebel-backed Idlib province, CNN reports.

The attack was particularly gruesome. The chemicals released possibly contained a nerve agent and other illegal substances that caused victims to gasp for air, writhe uncontrollably, and foam at the mouth while struggling to survive, rescue workers have reported, according to the New York Times.

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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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