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A Syrian man receives treatment following a suspected toxic gas attack in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, on April 4, 2017.
Warplanes carried out a suspected toxic gas attack that killed at least 35 people including several children, a monitoring group said. The Syrian Observatory for Human Rights said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms.
 / AFP PHOTO / Mohamed al-Bakour        (Photo credit should read MOHAMED AL-BAKOUR/AFP/Getty Images)
A Syrian man receives treatment following a suspected toxic gas attack in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, on April 4, 2017.
Warplanes carried out a suspected toxic gas attack that killed at least 35 people including several children, a monitoring group said. The Syrian Observatory for Human Rights said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms.
 / AFP PHOTO / Mohamed al-Bakour        (Photo credit should read MOHAMED AL-BAKOUR/AFP/Getty Images)

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Russia: Syrian gas deaths due to 'terrorists'

The Russian Defense Ministry says "terrorists" were holding chemical weapons at a depot that was hit by Syrian forces, resulting in the chemical gas deaths of dozens of civilians. CNN's Matthew Chance reports.