Kurdish-led Syrian Democratic Forces soldiers in Syria (Picture: PA).
Kurdish forces say they have begun the final push to defeat the so-called Islamic State (IS), also known as 'Daesh', in the last pocket it holds in eastern Syria.
The US-backed and Kurdish-led Syrian Democratic Forces (SDF) tweeted that the offensive began on Saturday.
This comes after more than 20,000 civilians were evacuated from the IS-held area in the eastern province of Deir el-Zour.
A spokesman said the aim of the current push is to end the military presence of "Daesh (IS) terrorists".
Since 2014, RAF aircrew based in Cyprus have been flying daily missions over Iraq and Syria as part of a coalition of nations fighting IS.
Operation Shader began as a humanitarian aid mission but has grown into a complicated mission to try and defeat IS.
US President Donald Trump predicted that IS will have lost all the territory it once controlled in Iraq and Syria by next week.
President Trump previously said IS were "doomed" as he announced the withdrawal of US troops from the country.
That announcement reportedly led to the resignation of then-Defense Secretary General James Mattis, who wrote in his resignation letter: "You have a right to have a secretary of defense whose views are better aligned with yours."
The Kurdish-led SDF launched its offensive to end the IS presence in Syria in September, a battle that left hundreds of fighters dead on both sides.