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Timeline: A brief history of attacks by 'Chemical Assad'
The deadly toxic gas attack on Khan Sheikhun in Idlib is the latest in a string of chemical attacks since the Syrian conflict began in March 2011.
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Dozens of people, including children, suffered respiratory problems and other symptoms [Getty]
Aircraft believed to be deployed by the Syrian regime or its allies used toxic gas to bomb a rebel-held town in northwestern Syria on Tuesday morning, killing at least 58 people.
Read the full story here: Rocket hits hospital treating Syria 'gas attack' victims |
Syria's opposition accused the regime of being behind the attack on Khan Sheikhun, in Idlib province, and demanded a United Nations probe.
It is the latest in a string of chemical attacks since the Syrian conflict began in March 2011.
Explore our interactive timeline to learn more: