In a statement released on Monday, the US-backed Syrian Democratic Forces (SDF) said it released at least 283 Syrians suspected of having ties to IS.
Meanwhile, a Red Cross official said the weak and fragile services at the al-Hol camp in northeastern Syria, which has been in recent weeks inundated with civilians and ISIL fighters fleeing from Baghouz, are on "the brink of collapse".
It comes a year after SDF commenced an offensive operation aimed at wiping out IS terrorists in the eastern Euphrates River region.
The Syrian Democratic Forces and allies from the US-led coalition smashed their way into the last sliver of IS territory in the village of Baghouz at the weekend, unleashing a deluge of airstrikes and artillery attacks on besieged fighters.
Although SDF fighters have chipped away at the dwindling patch of IS-held territory along the Euphrates, the battle has been protracted and advances slow. The US-led coalition denied the claims.
The U.S. -backed SDF - which Turkey strongly opposes because of its link to the separatist Kurdistan Workers Party (PKK) - is so far not part of ongoing United Nations -led talks to end the Syrian conflict, United Nations officials have said.
Adnan Afrin, spokesman and commander for SDF, told CNN that "more than 6,000 people have fled or left Baghouz within the past 48 hours and more are expected to arrive to the reception areas".
"We're slowing down the offensive in Baghouz due to a small number of civilians held as human shields", he said. "There have been a number of vehicle bombs, but we are targeting them and monitoring the cars left behind".
Colonel Sean Ryan, spokesperson for the US-led coalition that backs the SDF, said that boobytrapped tunnels and auto bombs had created unique challenges in the final days of the Baghouz campaign, slowing the campaign to a crawl.
"I would characterize the number of IS fighters now in SDF custody as thousands", Navy Commander Sean Robertson, a Pentagon spokesman, said in a statement, referring to the IS. "We are maybe on the threshold of a new battle", he said. However, he died in a mortar attack two days later. There's a particularly challenging issue with fighters from other countries who joined ISIS, and whose home nations now no longer want them back. The latest evacuees also include relatives of jihadists, as well as ISIS-held civilians, he added.
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