It was 6:30 in the morning, before most children had left for school. A series of airstrikes hit the town of Khan Shaykhun in Syria's Idlib Governorate on 4 April 2017. Three of the bombs carried conventional explosives. The fourth, which struck a road, carried sarin -- a nerve agent that kills by shutting down the body's ability to control its own muscles. Within ten minutes, residents reported a strange odor drifting through the streets. Then the convulsions started, the foaming at the mouth, the paralysis. By the time the morning was over, at least 89 people were dead -- 18 women and 33 children among them -- and more than 541 were injured. It was the deadliest use of chemical weapons in the Syrian Civil War since the Ghouta attack of August 2013.
Khan Shaykhun did not exist in isolation. The town sat in a region that had been under intensified aerial bombardment for weeks as the Syrian government and its Russian ally fought to capture the last rebel-held towns in the northern Hama Governorate. Five days before the sarin attack, airstrikes hit nearby al-Lataminah, exposing more than 70 people to an unidentified chemical agent. Victims showed symptoms of nausea, foaming, muscle spasms, and constricted pupils. Two suffered cardiac arrest. An orthopedic doctor died. The day before Khan Shaykhun, a chlorine gas attack reportedly struck the village of Al-Habit, injuring dozens and killing two children. The escalation followed a grim logic: each attack tested what the world would tolerate, each silence in response emboldening the next strike.
Sarin is an organophosphate nerve agent that inhibits the enzyme acetylcholinesterase, which normally breaks down the neurotransmitter acetylcholine after it has transmitted a nerve impulse. Without that enzyme, muscles receive continuous stimulation: they contract and cannot relax. Victims experience convulsions, fluid in the lungs, foaming at the mouth, and respiratory paralysis. Death comes from suffocation as the muscles controlling breathing seize up. At al-Rahma hospital in Idlib, where many victims were taken, medical staff described patients arriving unconscious, their bodies rigid, unable to breathe. Medecins Sans Frontieres later confirmed symptoms consistent with exposure to at least two different chemical agents -- sarin and chlorine. Turkey's Ministry of Health, testing victims transported across the border, formally identified sarin through blood and urine analysis. British scientists examining samples from the scene confirmed "sarin or a sarin-like substance."
The OPCW-UN Joint Investigative Mechanism concluded that the Syrian government carried out the attack. Chemical markers in the sarin samples matched Syria's known stockpile. The UN's Independent International Commission of Inquiry identified the aircraft as a Sukhoi 22 jet -- a type flown only by the Syrian Air Force -- which had conducted four airstrikes at 6:45 a.m. on 4 April. Three bombs carried conventional explosives; the fourth contained the nerve agent. Weather conditions that morning were, as the investigators noted with clinical precision, "ideal for delivering a chemical weapon": wind speed just over 3 kilometers per hour, no rain, practically no cloud cover, allowing the sarin to drift slowly downhill across the town. The Syrian government denied responsibility and called the attack a "fabrication." Russia said the incident was staged. When a Guardian journalist visited Khan Shaykhun two days later, the warehouse that officials claimed had been a rebel chemical depot was empty, containing only animal feed and a volleyball net.
Seventy-two hours after the attack, on the morning of 7 April 2017, the United States launched 59 Tomahawk cruise missiles at Shayrat Air Base, which American intelligence identified as the origin point for the chemical strike. It was the first intentional U.S. military strike against the Syrian government in the six years of the civil war. The Treasury Department followed on 24 April with sanctions against 271 employees of the Syrian Scientific Studies and Research Center for their alleged role in producing chemical weapons. The international response fractured along familiar lines. France concluded Syria was "unquestionably" the perpetrator. Russia vetoed a Security Council resolution for the eighth time on Syria. Iran called for an impartial investigation while blaming "terrorist groups." The attack on Khan Shaykhun did not end the use of chemical weapons in Syria. But it marked the moment when a line the international community had drawn in 2013 was crossed again -- with consequences that, for the first time, included American missiles.
Located at 35.45°N, 36.65°E in the Idlib Governorate of northwestern Syria. Khan Shaykhun sits along the M5 highway connecting Damascus to Aleppo. Shayrat Air Base, the target of the U.S. retaliatory strike, is located approximately 100 km to the southeast near Homs. The terrain is hilly agricultural land, quite different from the desert environment of Palmyra to the east. Nearest major city is Maarat al-Numan to the north. Idlib city lies approximately 40 km to the northeast.