The Ghouta chemical attack was a chemical attack carried out by the forces of Syrian President Bashar al-Assad, in the early hours of 21 August 2013 in Ghouta, Syria during the Syrian civil war. It was the deadliest use of chemical weapons in Syrian conflict and since the Iran–Iraq War. Two opposition-controlled areas in the suburbs around Damascus were struck by rockets containing the chemical agent sarin. Estimates of the death toll range from 281 to 1,729 people. The attack led to an international agreement to eliminate Syria's chemical weapons, but this was not completed and further chemical attacks occurred, including Khan Shaykhun in 2017 and Douma in 2018.
Inspectors from the United Nations Mission already in Syria to investigate an earlier alleged chemical weapons attack requested access to sites in Ghouta the day after the attack and called for a ceasefire to allow inspectors to visit the Ghouta sites. The Syrian Ba'athist government granted the UN's request on 25 August, and inspectors visited and investigated Moadamiyah in Western Ghouta the next day and Zamalka and Ein Tarma in Eastern Ghouta on 28 and 29 August.
The UN investigation team confirmed "clear and convincing evidence" of the use of sarin delivered by surface-to-surface rockets, and a 2014 report by the UN Human Rights Council found that "significant quantities of sarin were used in a well-planned indiscriminate attack targeting civilian-inhabited areas, causing mass casualties. The evidence available concerning the nature, quality and quantity of the agents used on 21 August indicated that the perpetrators likely had access to the chemical weapons stockpile of the Syrian military, as well as the expertise and equipment necessary to safely manipulate large amount of chemical agents." It also stated that the chemical agents used in the Khan al-Assal chemical attack earlier in 2013 "bore the same unique hallmarks as those used in Al-Ghouta".
The Syrian opposition as well as many governments, the Arab League and the European Union stated the attack was carried out by forces of Syrian President Bashar al-Assad. The Syrian and Russian governments blamed the opposition for the attack, the Russian government calling the attack a false flag operation by the opposition to draw foreign powers into the civil war on the rebels' side. Åke Sellström, the leader of the UN Mission, characterized government explanations of rebel chemical weapons acquisition as unconvincing, resting in part upon "poor theories".
Several countries including France, the United Kingdom and the United States debated whether to intervene militarily against Syrian Ba'athist government forces. On 6 September 2013, the United States Senate filed a resolution to authorize use of military force against the Syrian military in response to the Ghouta attack. On 10 September 2013, the military intervention was averted when the Syrian government accepted a US–Russian negotiated deal to turn over "every single bit" of its chemical weapons stockpiles for destruction and declared its intention to join the Chemical Weapons Convention.
In June 2018 the OPCW noted with concern that the Syrian Arab Republic had in reality neither declared nor destroyed all of its chemical weapons and chemical weapons production facilities.
The Ghouta area is composed of densely populated suburbs to the east and south of Damascus, part of the province of Rif Dimashq. Ghouta is a primarily conservative Sunni region. Since early in the civil war, civilians in rebel-held Eastern Ghouta almost entirely sided with the opposition to Syria's government. The opposition had controlled much of Eastern Ghouta since 2012, partly cutting off Damascus from the countryside. Muadamiyat al-Sham in Western Ghouta had been under government siege since April 2013. Ghouta had been the scene of continuing clashes for more than a year before the chemical attack, with government forces launching repeated missile assaults trying to dislodge the rebels. The week of the attack, the Syrian government launched an offensive to capture opposition-held Damascus suburbs.
The attack came one year and one day after US President Barack Obama's 20 August 2012 "red line" remarks, in which he warned: "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." Syria was one of five non-signatories to the 1997 Chemical Weapons Convention at the time. After the "red line" remarks, and before the chemical attack in Ghouta, chemical weapons were suspected to have been used in four attacks in the country.
The Khan al-Assal chemical attack occurred on 19 March 2013, when a government-controlled area of Khan al-Asal, a district of Aleppo in northern Syria, was struck by a rocket containing the nerve agent sarin. According to the Syrian Observatory for Human Rights the attack resulted in at least 26 fatalities, including 16 government soldiers and 10 civilians. The Syrian government later reported to the United Nations that one soldier and 19 civilians died and that 17 soldiers and 107 civilians were injured. A medic at the local civilian hospital said he personally had witnessed Syrian army soldiers helping the wounded and dealing with fatalities at the scene.
It was later found that the sarin used in the Khan al-Assal attack "bore the same unique hallmarks" as the sarin used in the Ghouta attack.
Independent International Commission of Inquiry
The United Nations Human Rights Council established the Independent International Commission of Inquiry on the Syrian Arab Republic on 22 August 2011 to investigate human rights violations during the Syrian civil war. One of the topics the commission investigated was possible use of chemical weapons. In early June 2013, the Fifth Report of the Commission of Inquiry stated that there were reasonable grounds to believe that toxic chemicals were used in four attacks, but more evidence was needed "to determine the precise chemical agents used, their delivery systems or the perpetrator". On 22 June, the head of the Commission of Inquiry, Paulo Pinheiro, said the UN could not determine who used chemical weapons in Syria based on evidence sent by the United States, Britain and France.
Assessments prior to the attack
US Secretary of Defense Chuck Hagel stated on 25 April that US intelligence showed the Assad government had likely used sarin on a small scale. However, the White House announced that "much more" work had to be done to verify the intelligence assessments.
On 13 June 2013, the United States government publicly announced it had concluded that the Assad government had used limited amounts of chemical weapons on multiple occasions against rebel forces, killing 100 to 150 people. US officials stated that sarin was the agent used. Deputy National Security Advisor Ben Rhodes did not say whether this showed that Syria had crossed the "red line" established by President Obama in August 2012. Rhodes stated: "The president has said that the use of chemical weapons would change his calculus, and it has." The French government announced that its own tests confirmed US assertions.
Russian Foreign Minister Sergei Lavrov said "the accusations of Damascus using chemical weapons put forth by the United States are not backed by credible facts". Lavrov further stated that the Syrian government had no motive to use chemical weapons since the government already maintained a military advantage over the rebel fighters.
The attacks affected two separate opposition-controlled districts in the Damascus suburbs, located 16 kilometres apart.
The first attack took place around 2:30 a.m. on 21 August 2013 in Eastern Ghouta, a rebel-held suburb to the east of Damascus. The area was on a rebel weapons supply route from Jordan and had been under siege by the Syrian military and Hezbollah for months.