>> This is not the first time Mamdu Abu Alsaood and his family have fled, but he's worried it might be the last. In the past few days, some 30,000 people have run from their homes in Idlib, as Bashar Al-Assad's forces advance on Syria's last rebel refuge.>>
> What happened was destruction all over, burning, something you can't describe.
>> There was nothing left in the north for us to go to. We are stuck here. What can we do?>> More than 1 million people have arrived in Idlib from other parts of Syria since 2015 when Assad, backed by Russian air power, began swiftly regaining territory.
st week, Syrian and Russian war planes resumed Idlib's bombardment.
at people fear is a prelude to a full blown assault has displaced thousands, many of them heading for camps like this one at the border with Turkey.
and his family escaped here after their village was targeted.>>
>> Turkey, which hosts some 3.5 million refugees, says it can't take in any more if Damascus launches its expected onslaught. In recent days, US officials said they have evidence that government forces are preparing chemical weapons. And on Monday, Donald Trump's national security advisor, John Bolton, warned Assad against using them.
Russia's Syria envoy to the United Nations says the situation in Idlib could still be settled peacefully, and that if an assault does ensue, the military will seek to minimize civilian casualties. That's not comforted UN chief, Antonio Guterres. He says it's absolutely essential to avoid a full scale battle.
>> This would unleash a humanitarian nightmare unlike any scene in the blood-soaked Syrian conflict.