More than half of Idlib province is held by Hayat Tahrir al-Sham, a jihadist alliance led by Syria's former Al-Qaeda affiliate, and Turkey has warned a government offensive could scatter thousands of foreign jihadists overseas, posing a security threat to the West.
Lowcock said the United Nations is doing "very detailed planning" to reach up to 800,000 displaced civilians and expects around 100,000 people to flee into government controlled areas with the remaining 700,000 initially fleeing attacks to other areas of Idlib.
"A staged provocation of so-called "chemical weapons" used by the Syrian army against civilians is now being filmed in Jisr al-Shughur", the ministry said in a statement carried by Russian news wires Tuesday.
Regarding the peace talks, de Mistura said earlier in Geneva that his discussions with the senior Russian, Turkish and Iranian officials taking place on September 10 and September 11 for the new process are the best "roadmap we can see". "Conventional weapons are responsible for far more deaths", he said.
The German Defense Ministry is reportedly in talks with the USA on potentially taking an active role in airstrikes in the event that Syria's President Bashar al Assad uses chemical weapons in Idlib province.
As Russia continues to bombard the northwestern Syrian province of Idlib from the skies, in support of the country's ruling government's campaign to retake territory, Washington is warning of retaliatory strikes.
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"A tragedy that will occur in a possible [military] operation in Idlib is not only Turkey's problem but Europe's as well", Yildirim said.
Erdogan failed to secure a pledge for a ceasefire from Russian Federation and Iran at a trilateral summit in Tehran.
The U.S., Britain and France have pledged to respond to any use of chemical weapons in Idlib.
"We as humanitarian advocates must raise our voice", said Jens Laerke from the Office for the Coordination of Humanitarian Affairs (OCHA). "We are very actively preparing for the possibility that civilians move in huge numbers in multiple directions".
Many made a dash for Syria's northern border with Turkey, with just under half seeking refuge in displacement camps and others living with local families or renting apartments.
Turkey now hosts almost 3.5 million Syrian refugees, more than any other country in the world.
And Haley warned Assad and his allies for a second time that any assault on Idlib would be considered "reckless" by the US and "the consequences will be dire".
"More than two million of them came from other areas of Syria, some from Ghouta, some from Aleppo".