The Fox News published a report that highlights the use of chemical weapons by the Syrian regime in Syria's seven-year civil war.
Chemical weapons have killed hundreds of people since the start of the conflict, with the U.N. blaming four attacks on the Syrian government and a fifth on the Islamic State group.
The following is a timeline of chemical weapons attacks in Syria:
March 19, 2013: The Syrian government and opposition trade accusations over a gas attack that killed some 26 people, including more than a dozen soldiers, in the town of Khan al-Assal in northern Syria. A U.N. investigation later finds that sarin nerve gas was used, but does not identify a culprit.
Aug. 21, 2013: Hundreds of people suffocate in rebel-held suburbs of the Syrian capital, with many suffering from convulsions, pinpoint pupils, and foaming at the mouth. U.N. investigators visit the sites and determine that ground-to-ground missiles loaded with sarin were fired on civilian areas while residents slept. The U.S. and others blame the Syrian government, the only party to the conflict known to have sarin gas.
Sept. 27, 2013: The U.N. Security Council orders Syria to account for and destroy its chemical weapons stockpile, following a surprise agreement between Washington and Moscow, averting U.S. strikes. The Security Council threatens to authorize the use of force in the event of non-compliance.
Oct. 14, 2013: Syria becomes a signatory to the Chemical Weapons Convention, prohibiting it from producing, stockpiling or using chemical weapons.
June 23, 2014: The Organization for the Prohibition of Chemical Weapons says it has removed the last of the Syrian government's chemical weapons.
Aug. 7, 2015: The U.N. Security Council authorizes the OPCW and U.N. investigators to probe reports of chemical weapons use in Syria, as reports circulate of repeated chlorine gas attacks by government forces against civilians in opposition-held areas. Chlorine gas, though not as toxic as nerve agents, can be classified as a chemical weapon depending on its use.
Aug. 24, 2016: The joint OPCW-U.N. panel determines the Syrian government twice used helicopters to deploy chlorine gas against its opponents, in civilian areas in the northern Idlib province. A later report holds the government responsible for a third attack. The attacks occurred in 2014 and 2015. The panel also finds that the Islamic State group used mustard gas.
Feb. 28, 2017: Russia, a stalwart ally of the Syrian government, and China veto a U.N. Security Council resolution authorizing sanctions against the Syrian government for chemical weapons use.
April 4, 2017: More than 90 people are killed in a suspected nerve gas attack on the town of Khan Sheikhoun in the rebel-held Idlib province. Victims show signs of suffocation, convulsions, foaming at the mouth and pupil constriction. Witnesses say the attack was carried out by either Russian or Syrian Sukhoi jets. Moscow and Damascus deny responsibility.
April 5, 2017: Trump says Assad's government has "crossed a lot of lines" with the suspected chemical attack in Syria.
April 6, 2017: The U.S. fires cruise missiles into Syria in retaliation for the Khan Sheikhoun attack, in the first direct American assault on the Syrian government.
Oct. 26, 2017: Experts from the U.N. and the chemical weapons watchdog blame the Syrian government for the attack on Khan Sheikhoun. The report supports the initial findings by the United States, France and Britain that a Syrian plane dropped a bomb with sarin on the town of Khan Sheikhoun.
April 7, 2018: Syrian activists, rescuers and medics say a poison gas attack on the rebel-held town of Douma near the capital has killed at least 40 people. The Syrian government and Russia reject the allegations, saying the purported evidence of a chemical weapons attack was fabricated.
April 9, 2018: Trump says he will decide on a U.S. response to the Douma attack "probably by the end of today."
April 14, 2018: US, France, and UK launched missiles strike against Assad's chemical facilities, but it's believed that Assad's stock of chemicals is stored in ''Human Shields.''
BY ASSOCIATED PRESS