The Organisation for the Prohibition of Chemical Weapons confirmed the destruction of the entire chemical weapons stockpile in Albania.
- Syria hands over its remaining 100 tonnes of its declared chemical weapons to the United Nations Organisation for the Prohibition of Chemical Weapons but the organisation cannot declare that the country no longer has any such weapons.
- The United States launches 60 Tomahawk cruise missiles aimed at the Ash Sha'irat air base in Homs Governorate in response to the Syrian government's alleged use of chemical weapons in its attack on the town of Khan Shaykhun. The Government of Syria claims the attack killed six soldiers and nine civilians, including four children.
- The Organisation for the Prohibition of Chemical Weapons says, for the first time, that they suspect Syrian President Bashar al-Assad and other senior officials of the Syrian government are responsible for the use of chemical weapons in the conflict.
- The United Nations Security Council unanimously adopts a resolution aimed at identifying those responsible for deploying chlorine and other chemical weapons in attacks in Syria.
- Eleven people, including six members of a United Nations Organisation for the Prohibition of Chemical Weapons fact finding mission, are attacked near Hama in central Syria.
- Chemical weapons are used again in Syria, this time on the town of Kafr Zita, Hama.
- The Organisation for the Prohibition of Chemical Weapons agrees to a Syria arsenal destruction plan.
- Protests are held in Albania against the proposal to bring Syria's chemical weapons stockpile to be destroyed in the country.
- The Organisation for the Prohibition of Chemical Weapons declares that Syria has destroyed 21 of 23 known chemical weapons facilities, and now must destroy the chemical weapons themselves.
- The Organisation for the Prohibition of Chemical Weapons wins the Nobel Peace Prize.