Reuters TV footage of the Islamic State-controlled frontline shows armed militants, most with only their eyes visible, supervising the evacuations from a scrubby patch of agricultural land scattered with vehicles and a few buildings.
The SDF has said the fighters staying put through waves of evacuations are the most hardened foreign militants, wanted by governments around the world, who are likely to fight to the death.
On Saturday, a Reuters witness saw dozens of mostly men cross from Islamic State territory into SDF-controlled lines. The SDF said these were wounded Islamic State fighters.
A few women in full face-covering black robes and children carrying bags could be seen among the people milling at the frontline. A man on crutches was also visible.
A no-man's land of about 200m separates SDF positions from the Islamic State frontline at Baghouz, a collection of hamlets and farmland near the border with Iraq.
Evacuees are screened by the SDF as they emerge and are sent north to the al-Hol camp, already overcrowded with uprooted Syrians and Iraqis from years of war and struggling to cope with the influx.
After suddenly seizing swathes of land straddling the Iraqi-Syrian border in 2014 and declaring it their caliphate, Islamic State was beaten back by numerous local and foreign forces in both countries, suffering major defeats in 2017.
However, the jihadists remain a threat. In Iraq they have gone to ground, staging waves of killings and kidnappings. In Syria, their comrades hold out in remote desert areas and have carried out bombings in areas controlled by the SDF.
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