Chemical watchdog accepts Russia's offer to aid Syria probeOPCW accepts Russia's offer to provide it with possible evidence of chemical attack in Aleppo.
OPCW probing over 20 reports of Syria chemical attacksOrganization for the Prohibition of Chemical Weapons believes ISIS may have manufactured mustard gas used in Syria and Iraq.
Chemical watchdog condemns both Syria and ISISExecutive body of global chemical arms watchdog condemns both Syria and ISIS for using toxic weapons.
UN extends Syria chemical attacks probeSecurity Council extends mandate of a panel investigating chemical attacks in Syria until November 18.
Syrian rebels use toxic gas in AleppoSyrian state media claims rebels fired shells containing toxic gas into government-held parts of Aleppo.
Russia: Report on Syria chemical weapons unconvincingRussia dismisses UN-led investigation showing that Syrian forces carried out three chemical attacks, opposes sanctions.
UN extends Syria chemical weapons probeUN Security Council gives panel investigating chemical weapons use in Syria another month to complete its work.
UN inquiry blames Syrian military for chlorine attacksUN inquiry identifies two Syrian Air Force helicopter squadrons and two other units in chlorine gas attacks, says Western diplomat.
Syrian regime denies using chlorine, blames 'terrorists'Syrian government denies it used chlorine gas in an attack in Aleppo, following which dozens were treated for breathing problems.
Chemical watchdog concerned over chlorine attack in AleppoOrganization for the Prohibition of Chemical Weapons says it is "disturbed" by the alleged use of toxic chemicals in Aleppo.
Syrian regime reportedly uses chlorine gas in AleppoDozens of people treated for breathing problems in Aleppo after regime helicopters drop barrel bombs which may have contained chlorine gas.
Russia rejects UN findings on Syrian chemical weaponsRussia says findings of a UN-led investigation on Syrian chemical attack are not conclusive enough to trigger sanctions.
France presses UN to condemn Syrian chemical attacksFrance pressing Security Council members to condemn the Syrian government over report that Syrian troops used chemical weapons.
U.S. calls for Assad to be held accountable for chemical attacksWhite House says it is "impossible to deny" that Syria launched chemical weapon attacks.
UN report determines both Assad and ISIS used chemical weaponsUN investigation finds Syrian President's forces carried out at least two chemical attacks, and ISIS jihadists used mustard gas as a weapon.
France concerned over reports of chemical attack in SyriaFrance alarmed at reports of a deadly chemical attack in the Syrian battleground city of Aleppo.
Watchdog demands Syria explain chemical warfare agentsOPCW pressing Syria to explain why it still has four undeclared chemical warfare agents.
Russia seeks resolution on Syria chemical weaponsRussia and China propose UN resolution that would have states report when terrorists are developing chemical weapons in Syria.
Obama 'proud' of decision not to attack SyriaPresident says he does not regret not attacking Syria despite warning that its using chemical weapons would be crossing a red line.
State Department 'aware' of reports of Syria chemical attacksState Department spokesman: Washington is aware of reports that chemical weapons were used in Syria, but can't confirm them.
UN team probing chemical attacks to visit Syria in MarchUN team tasked with identifying those responsible for chemical attacks in Syria will begin investigations in early March.
OPCW: Syria's chemical arsenal completely destroyedUN chemical weapons watchdog says Syria's arsenal has been completely destroyed after more than two years of work.
UN watchdog finds traces of sarin exposure in SyriaOPCW says it has found that some people in Syria may have been exposed to sarin or a sarin-like gas.
Hagel: Obama hurt his credibility by failing to act in SyriaFormer Defense Secretary criticizes President Obama for his failure to follow up on a warning to Syria about using chemical weapons.
Syria denies using chemical weapons in civil warSyria tells global watchdog it is fully cooperating with the destruction of its toxic stockpile, as agreed upon in 2013.
Global watchdog voices 'concern' over chemical arms use in SyriaOrganization for the Prohibition of Chemical Weapons calls for those behind chemical attacks in Syria to be held accountable.
OPCW 'confident' that mustard gas was used in SyriaUN chemical weapons watchdog confirms mustard gas was used in Syria in August, and also reports yet another chlorine attack.
UN watchdog: Mustard gas was used in SyriaOPCW source says it has been concluded that mustard gas was used during fighting in Syria, but can't say who used it.
Russia Reportedly Delaying Syrian Chemical Weapons ProbeDiplomats say Russia is delaying the launch of UN investigation aimed at assigning blame for chemical weapon attacks in Syria.
Security Council Approves Syria Chemical Weapons ProbeUN Security Council votes unanimously to set up a panel to identify who is behind deadly chlorine gas attacks in Syria.
Will Perpetrators of Syria Chemical Attacks be Identified?United States and Russia agree on draft UN resolution aimed at identifying the perpetrators of chemical weapons attacks in Syria.
White House Concerned Over Syrian Chemical WeaponsWhite House concerned over the fact that undeclared traces of chemical weapons were found in Syria.
Diplomats: Traces of Undeclared Sarin and VX Found in SyriaInternational inspectors have found traces of sarin and VX nerve agent in Syria that had not been declared to the OPCW.
Syria Destroys Three Chemical Weapons SitesIn latest report, OPCW says Syria has destroyed three of its 12 chemical weapons production sites.
UN Head of Disarmament Steps DownRepresentative in charge of disarming Syria's chemical weapons steps down, will be replaced by adviser to Ban Ki-Moon.
UN Investigators Highly Confident Chlorine Was Used in SyriaChemical weapons investigators conclude "with a high degree of confidence" that chlorine gas was used in Syria last year.
Syria Declares Four More Chemical FacilitiesSyria declares four chemical weapons facilities it had not mentioned before, raising concerns among the West.
Panetta Criticizes Obama Over Failure to Act in SyriaIn new book, former defense chief criticizes Obama's backtracking on action in Syria over its use of chemical weapons.
Kerry: Assad Will be Held to Account for Using ChlorineSecretary of State John warns Assad's regime it would be held to account for using chlorine gas against civilians.
Kerry: Assad Violated Chemical Weapons TreatySecretary of State says there is evidence that Syrian President is using chlorine gas “in violation” of a global chemical weapons treaty.
Israeli Official: Syria Has Retained Some Chemical WeaponsIsrael believes Syria has retained caches of combat-ready chemical weapons after giving up raw materials, says senior Israeli official.
OPCW Confirms Chlorine Gas was Used in SyriaThe Organization for the Prohibition of Chemical Weapons says it found "compelling confirmation" of the use of chlorine gas in Syria.
U.S. Concerned Terrorists Will Seize Syrian Chemical WeaponsWashington concerned that the most dangerous terrorist groups could get a hold of chemical weapons if Syria is hiding any stockpiles.
Obama: Syria's Chemical Stockpile Has Been EliminatedU.S. President announces that Syria's declared chemical weapons stockpile has been eliminated, says it's "an important achievement".
Three Quarters of Syria's Chemicals DestroyedThree quarters of Syria’s chemical stockpile has been destroyed, says Organization for the Prevention of Chemical Weapons.
UN Chemical Experts to Return to Syria Next MonthA team of chemical weapons experts will travel to Syria next month to follow up on Damascus' pledge to hand over its arsenal.
Syrian Chemical Weapons Loaded onto American ShipSyrian chemical weapons loaded onto a the MV Cape Ray, a day after it arrived in the southern Italian port of Gioia Tauro.
U.S. Ship Arrives in Italy to Destroy Syria's Chemical WeaponsMV Cape Ray arrives in southern Italy for the transfer and destruction of 1,300 tons of Syrian chemical weapons.
Syria Ships Out Last Declared Chemical StockpileOPCW says the final stockpile of Syria's chemical weapons has been shipped out of the country.
Inspectors Say Chlorine Gas Was Likely Used in SyriaChemical weapons inspectors say they found information suggesting that chlorine gas had been used in Syria.
Chlorine Gas Attacks in Syria? Investigations 'Inconclusive'Paris backpedals on statements accusing Syrian regime of using chlorine gas after lab tests prove nothing.
Kerry: 'Raw Data' Suggests Syria Used Chlorine GasU.S. Secretary of State says he has seen “raw data” indicating that the Syrian government has used chlorine gas in a “number of instances”.
France: Too Bad Obama Didn't Strike in SyriaFrance's Foreign Minister says the Syrian regime is believed to have used chemical weapons 14 times since late 2013.
Destruction of Syria's Chemical Weapons Nearly CompleteSyria has nearly completed surrendering its chemical weapons stockpile, say UN and OPCW.
Chlorine Gas a Loophole in OPCW Agreement?Claim: International agreement banned sarin gas, but not chlorine - leading Syria to use the loophole in more attacks.
Syria Submits 'Specific' List of Chemical Weapons to OPCW'Discrepancies' were found in the original list Syria provided to the joint mission, officials claim, amidst rumors of more attacks.
Report: Another Chemical Weapons Attack in Syria?Israeli defense officials believe Assad's forces have attacked again in Damascus - twice.