Syria chemical weapons program Syria ' s chemical weapons program began in the 1970s with weapons and training from Egypt and the Soviet Union , with production of chemical weapons in Syria beginning in the mid - 1980s . In September 2013 Syria joined the Chemical Weapons Convention ( formally acceding on 14 October ) , and agreed to the destruction of its weapons , to be supervised by the Organisation for the Prohibition of Chemical Weapons , as required by the Convention . Syria had been one of a handful of states which had not ratified the Convention , and joined after international condemnation of the August 2013 Ghouta chemical attack , which Western states held the Syrian government responsible for ( whilst Syria and Russia held the Syrian rebels of the Syrian civil war responsible ) . Prior to September 2013 Syria had not publicly admitted to possessing chemical weapons , although Western intelligence services believed it to hold one of the world ' s largest stockpiles . In September 2013 , French intelligence put the Syrian stockpile at 1 , 000 tonnes , including Yperite , VX and " several hundred tonnes of sarin " . Overview . Public stance . Prior to entry into force on 14 October 2013 of Syria ' s instrument accession , Syria was one of five states that had not signed and seven that had not ratified the Chemical Weapons Convention , which prohibits the development , production , stockpiling , transfer , and use of chemical weapons . However , in 1968 , Syria acceded to the 1925 Geneva Protocol for the Prohibition of the Use in War of Asphyxiating , Poisonous or Other Gases . Syria had repeatedly pledged to ratify the CWC if its neighbouring countries , especially Israel , ratify the convention . In the aftermath of the 2003 invasion of Iraq , Syria stated that it had no chemical weapons , but stated it possessed such weapons in 2012 . The Syrian president had earlier alluded to a chemical weapon capability in public statements , in 1990 and 1997 . Western non - governmental organizations stated they believed Syria had an active chemical weapons program . In September 2013 , Syria provided information about its stockpile to the OPCW as part of its disarmament obligations . However , the exact composition of its declared chemical arsenal will not be disclosed to the public , due to OPCW rules . Motivation . A number of reasons have been postulated for Syria ' s adoption of a chemical weapon strategy in the 1980s : Stockpiling and production . According to some US analysts , Syria was provided with some chemical weapons and delivery systems prior to the 1973 Yom Kippur War . According to US intelligence reports , Syria began to develop its chemical weapons capabilities in the later 1970s , with supplies and training from the Soviet Union , and likely with equipment and precursor chemicals from private companies in Western Europe . However Syrian production of chemical weapons is not believed to have begun until the mid - 1980s . The Director of the US Defense Intelligence Agency said in 2013 that the Syrian program had never become fully independent , and remained reliant on the importing of precursor chemicals . In 1988 , a U . S . analyst described Syria ' s chemical weapon capability as more advanced than the Iraqi chemical weapons program ; however , Israel stated in 1989 that Syria had only the " potential for chemical warfare , but not more than that " . In July 2007 , a Syrian arms depot exploded , killing at least 15 Syrians , as well as 10 Iranians . Jane ' s Defence Weekly , a U . S . magazine reporting on military and corporate affairs , believed that the explosion happened when Iranian and Syrian military personnel attempted to fit a Scud missile with a mustard gas warhead . Syria stated that the blast was accidental and not chemical related . Capabilities in 2013 . A 2007 assessment indicated that Syria was capable of producing several hundred tons of chemical weapon agents per year . Another 2007 report said that Syria was believed to have a stockpile of hundreds of tonnes of chemical weapons agents . Syria was believed to be able to deliver chemical weapons by aerial bombs , surface - to - surface missiles and artillery rockets . In September 2013 , a French intelligence report put the Syrian stockpile at over 1 , 000 tonnes , including nerve agents and their precursors . This included several hundred tons of Yperite , several hundred tons of sarin , and tens of tons of VX . The report stated that Syria uses a " binary form " technique which demonstrates that Syria has acquired " great knowledge " of chemical weapon technology . As delivery systems the report highlighted as longer - range systems Scud B and Scud C missiles , with a range of 300 and 500 km respectively ; and the M - 600 ( a Syrian version of the Iranian Fateh - 110 ) with a range of 250 – 300 km . Shorter - range systems include SS21 missiles ( 70 km ) ; aerial bombs ; and artillery rockets and related short - range tactical systems ( 50 km or less ) . As of October 2013 , some experts believe Syria has around 300 metric tonnes of sulfur mustard and around 700 metric tonnes of nerve agents . By the end of October 2013 , the OPCW found a total of 1 , 300 metric tons of chemical weapons . According to French intelligence , the Syrian Scientific Studies and Research Center ( SSRC ) is responsible for producing toxic agents for use in war . A group named " Branch 450 " is allegedly responsible for filling munitions with chemicals and maintaining security of the chemical agent stockpiles . Facilities . Syrian chemical weapons production facilities have been identified by Western nonproliferation experts at approximately 5 sites , plus one suspected weapons base : Disarmament . Following the Ghouta attacks , Secretary - General of the United Nations Ban Ki - moon suggested that he might request that the United Nations Security Council vote to demand that Syria ratify the CWC . On September 10 , Syria announced its intention to join the chemical weapons convention , following a Russian proposal to assist Syria with disposing of their chemical arsenal , and subsequently submitted an instrument of accession to the United Nations as the depositary . They formally acceded to the CWC on 14 September , but the convention will only come into force for Syria 30 days after their deposit of the instrument of accession on 14 October . In a telephone call with the OPCW director - general , Syrian Deputy Minister Faisal Mekdad asked for technical assistance and requested that the CWC be provisionally in force prior to its formal entry in force . The OPCW announced that this request had been circulated with its member states . On September 14 , the United States and Russia announced that they had agreed to a disarmament framework that would eliminate Syria ' s chemical weapons programs . Under this framework : On September 27 , the Organisation for the Protection of Chemical Weapons agreed on an accelerated program for eliminating Syria ' s chemical weapons by mid - 2014 , consistent with this framework . Use . Syrian civil war . Syria is thought to have the world ' s third - largest stockpile of chemical weapons , after the United States and Russia . At the outbreak of civil war concerns were raised about both the security of Syria ' s chemical weapons sites and about the potential use of chemical weapons . In July 2012 Syrian Foreign Ministry spokesman Jihad Makdissi stated that " No chemical or biological weapons will ever be used . . . All of these types of weapons are in storage and under security and the direct supervision of the Syrian armed forces and will never be used unless Syria is exposed to external aggression . " A Syrian defector who worked inside the chemical weapons network alleged that in January 2012 two senior Syrian officers moved about 100 kg . of chemical weapons materials from a secret military base in Nasiriyah . The Syrian source also described construction of special trucks , which could transport and mix the weapons . These mobile mixers were constructed inside Mercedes or Volvo trucks that were similar to refrigerator trucks . Inside were storage tanks , pipes and a motor to drive the mixing machinery , the defector said . In September 2012 , the Syrian military began moving its chemical weapons from Damascus to the port city of Tartus . That same month , it was reported that the military had restarted testing of chemical weapons at a base on the outskirts of Aleppo . On 28 September , US Defence Secretary Leon Panetta stated that the Syrian regime had moved its chemical weapons in order to secure them from approaching opposition forces . It emerged that the Russian government had helped set up communications between the United States and Syria regarding the status of Syria ' s chemical weapons . Russian Foreign Minister Sergei Lavrov stated that Syria had given the United States " explanations " and " assurances " that it was taking care of the weapons . On 8 December , it was reported that members of the jihadist Al - Nusra Front had recently captured a Saudi - owned toxic chemicals plant outside of Aleppo . On 22 December 2012 , Russian Foreign Minister Sergei Lavrov stated that Syria had consolidated chemical weapons into one or two places to prevent rebels capturing them , and that recent moves that had alarmed Western governments were part of this consolidation . Brigadier General Mustafa al - Sheikh , a Syrian army defector , confirmed that most of the chemical weapons have been transported to Alawite areas in Latakia and near the coast . Some chemical munitions remain in bases around Damascus . In December 2012 McClatchy reported various chemical weapons experts ' skepticism that Syria was preparing to use chemical weapons , noting their " limited utility " in a civil war situation with fluid battlelines , and Syria ' s comments that such use would be " suicide " in view of US threats of retaliation . Incidents . On 23 December 2012 , Al Jazeera released unconfirmed reports that a gas attack killed 7 civilians in the rebel - held al - Bayyada neighbourhood of Homs . Some American officials felt there was a " compelling case " the regime forces had used Agent 15 , but the White House was initially skeptical . On 19 March 2013 , unconfirmed reports surfaced , after initial reports on the Syrian state news agency SANA , that missiles armed with " chemical materials " may have been fired into the Khan al - Assal district in Aleppo and the Al Atebeh suburbs of Damascus , both of which are largely held by the opposition . Both sides accused each other of carrying out the attack . The Syrian Observatory for Human Rights said that 16 government soldiers and 10 civilians had been killed in the Khan al - Assal chemical attack after a rocket landed on Khan al - Assal . Activists said that the government had tried to hit the rebel - held police academy with a Scud missile , but the missile accidentally landed in a government - controlled area instead . An unnamed Reuters photographer described the gas as having a " " chlorine - like smell " " and claimed to have witnessed victims suffocating . Officials from within the United States government disputed this claim and stated that there had been no substantive evidence of chemical warfare in Syria , while , the Russian government indicated that it was taking the Syrian government ' s claim seriously . Unusually , Syria requested that the UN send inspectors to investigate . In April 2013 Zahir al - Sakit or al - Sakat , a former Syrian army general from the chemical weapons branch , said he had been instructed to use chemical weapons in caves and tunnels that are used by the FSA , during battles in the southwestern area of Hauran . But instead , Sakit disobeyed the orders and swapped the chemicals with disinfectant water he called " Javel water " . After spending two months in the rebel - held Jobar district of Damascus , several reporters for the French news media " Le Monde " personally witnessed chemical weapons attacks on civilians in the Jobar chemical attacks , holding the Syrian Army responsible . On 29 April 2013 , a chemical attack was reported , in Saraqib , in which 2 died and 13 were injured . The attack was said to involve canisters of white - grey powder dropped from a helicopter . The injured were taken to Turkey . On 5 May , Turkish doctors said initial test show that no traces of sarin had been found in the blood samples of victims . French intelligence acquired blood , urine , earth and munitions samples from victims or sites of attacks on Saraqeb , on 29 April 2013 , and Jobar , in mid April 2013 . The analysis carried out confirms the use of sarin . It is believed the SSRC military research center in Jamraya near Damascus , which Israel struck on 5 May 2013 , held chemical weapons . On 21 August 2013 , the area of Ghouta was the scene of an alleged Assad government chemical weapons attack that caused the deaths of 1 , 300 people according to the opposition Local Coordination Committees and the Syrian National Council . Reports . On 13 April 2013 , " The Times " reported that British military scientists had found forensic evidence of chemical weapons being used in the conflict , after examining a soil sample smuggled out of Syria . The perpetrators of the probable gas attacks remain unknown . On 18 April 2013 . Britain and France sent a confidential letter to the UN , claiming that there was evidence that the Syrian government had used chemical weapons on more than one occasion since December . Saying that soil samples , witness interviews and opposition sources support charges that nerve agents were used in and around the cities of Aleppo , Homs and possibly Damascus . Israel also claimed that the Syrian government had used chemical weapons on 19 March near Aleppo and Damascus . By 25 April the U . S intelligence assessment was that the Assad regime had likely used chemical weapons – specifically sarin gas . However , the White House announced that " much more " work had to be done to verify the intelligence assessments . Syria has refused an investigation team from the UN from entering Syria , though Jeffrey Feltman , UN under - secretary for political affairs , said on Wednesday that a refusal would not prevent an inquiry from being carried out . A U . N . report in June stated that there were " reasonable grounds " to believe that limited amounts of chemical weapons had been used in at least four attacks in the civil war , but more evidence was needed to determine the exact chemical agents used or who was responsible . Stating that it had not been possible " to determine the precise chemical agents used , their delivery systems or the perpetrator . " In June 2013 , British and French authorities claimed to have evidence that Sarin nerve gas has been used in Syria , these findings and evidence have been passed on to the US government . The evidence was largely made up of samples of bodily fluids taken from individuals who claim to have been affected . On 13 June 2013 , the United States announced that there was definitive proof that the Assad government had used limited amounts of chemical weapons on multiple occasions on rebel forces , killing 100 to 150 people . On 9 July 2013 , the Russian Federation submitted the results of its inquiry into the use of chemical weapons at Khan al - Assal to the United Nations . Russian scientists analyzing the 19 March 2013 attack found that it was most likely launched by opposition forces , and not the Syrian government . JIC assessed that the Syrian regime used lethal CW on at least 14 occasions from 2012 . Additionally concluding that the Ghouta attack on 21 August 2013 was undertaken by the Syrian regime , concluding that " there are no plausible alternative scenarios to regime responsibility " . International reactions . On August 20 , 2012 , President of the United States Barack Obama used the phrase " red line " in reference to the use of chemical weapons in the Syrian civil war , saying , " We have been very clear to the Assad regime , but also to other players on the ground , that a red line for us is we start seeing a whole bunch of chemical weapons moving around or being utilized . That would change my calculus . That would change my equation . " The phrase became a source of contention when political opponent John McCain said the red line was " apparently written in disappearing ink , " due to the perception the red line had been crossed with no action . On the one year anniversary of Obama ' s red line speech the Ghouta chemical attacks occurred . Obama then clarified " I didn ' t set a red line . The world set a red line when governments representing 98 percent of the world ' s population said the use of chemical weapons are abhorrent and passed a treaty forbidding their use even when countries are engaged in war , " a reference to the Chemical Weapons Convention . A few days later during a speech given on August 31 , 2013 in reaction to the Ghouta chemical attacks , President Obama asked the United States Congress to authorize direct American military intervention in the civil war . The United States Senate Committee on Foreign Relations approved the Authorization for the Use of Military Force Against the Government of Syria to Respond to Use of Chemical Weapons ( S . J . Res 21 ) on September 4 , 2013 . If the bill passes , it would allow the president to take direct action for up to 90 days ; it specifically forbids putting " boots on the ground . "