The gas attack at Kahn Sheikhoun, described by the opposition Syrian National Coalition as a "horrifying massacre," is widely believed to be the worst such violation of international law in war-ravaged Syria since 2013, when a U.N. probe found credible evidence that sarin gas killed hundreds of civilians near Damascus.
A Day After Deadly Gas Attack in Kahn Sheikhoun, Syria
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A still image taken from a video posted to a social media website on April 4, 2017, shows people lying on the ground, said to be in the town of Khan Sheikhoun, after what rescue workers described as a suspected gas attack in rebel-held Idlib, Syria.
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A still image taken from a video posted to a social media website on April 4, 2017, shows a man lying on the ground and being sprayed with water, said to be in the town of Khan Sheikhoun.
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A civil defense member breathes through an oxygen mask, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun, April 4, 2017.
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Men ride a motorbike past a hazard sign at a site hit by an airstrike on Tuesday in the town of Khan Sheikhoun, April 5, 2017. The hazard sign reads, "Danger, unexploded ammunition."