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U.S. saw yearlong rise in chemical weapons use by Syria - Los Angeles Times
A soldier of the Syrian Arab Army is wearing a gas mask while another man prepares a new filter for him on September 09, 2013 in the Old City of Damascus, Syria.
Israelis ready gas masks amid Syrian fears
Syria's chemical weapons – DW – 04/26/2013
White House Concerned About Syria Chemical Weapons Allegations
Syria Fears Send Israelis Running for Gas Masks — Naharnet
Sarin Fast Facts | CNN
Do Gas Masks Work? | Poisonous Gas Masks | Live Science
OPCW Confirms Two Chemical Incidents in Syria | Arms Control Association
Gas Mask CBRN Riot Control | MSA Safety | Mexico
Demand for gas masks triple in Israel | Bollywood News – India TV
Syrian kids' last hope against Assad - gas masks made out of PAPER CUPS - World News - Mirror Online
Ukraine conflict: How will we know if Russia used chemical weapons? - BBC News
A soldier of the Syrian Arab Army is wearing a gas mask on September 09, 2013 in the Old City of Damascus, Syria. Photo: Martin Lejeune Stock Photo - Alamy
Forensic Details in U.N. Report Point to Assad's Use of Gas - The New York Times
Russia calls for UN probe in alleged Syria gas attack | Al Jazeera America
Syria Sees Israel Through a Rose-Colored Gas Mask — Charisma News
Syrian Bombs Are Now Filled With Chemicals — And Could Be Up for Grabs | WIRED
What Sarin Nerve Gas Is, How It Works, and How the Chemical Is Treated
Syrians try to build case against Assad in chlorine attacks
The lives of Syrian rebels
A soldier of the Syrian Arab Army is wearing a gas mask on September 09, 2013 in the Old City of Damascus, Syria. Photo: Martin Lejeune Stock Photo - Alamy
Eliminating Syria's chemical weapons | Feature | Chemistry World
Syria provides first details of its chemical weapons | The Times of Israel
Genetically Engineered Virus Protects Mice Against Deadly Effects of Nerve Gas and Pesticides | Inside Science
U.S. has no evidence of Syrian use of sarin gas, Mattis says | PBS NewsHour