Royal Marines seize control of an oil tanker off the coast of Gibraltar that was en route to Baniyas in Syria, suspected of breaching EU sanctions against Syria, carrying Iranian crude oil. The United Kingdom's Ambassador to Iran, Robert Macaire, is summoned in Tehran over the incident, which Iran describes as an "illegal seizure".
The Obama administration claims that Russia was responsible for the bombing of a United Nations aid convoy near Aleppo on September 19. Russia denies its involvement. In the aftermath of the attack, the United Nations suspends all aid convoys in Syria.
Russia's Federal Security Service (FSB) says it has thwarted two armed Ukrainian incursions into Crimea with at least two killed, including one FSB officer, following a "massive fire fight" with "sabotage-terrorist" groups. Ukraine denies the Russian claims.
The United Arab Emirates suspends air strikes against the Islamic State after a video of a Jordanian air force pilot being burned alive is published online. The suspension involves concerns over a lack of coalition search and rescue capabilities in Syria to recover downed pilots.
Rebel forces seize parts of the Sheikh Suleiman army base near Aleppo after weeks of heavy fighting. Ground clashes continue in the suburbs of Damascus as the government carries out further air raids against opposition forces.