The Latest: SDF official: 500 surrender in eastern Syria

Columns of black smoke billow from the last small piece of territory held by Islamic State militants as U.S. backed fighters pounded the area with artillery fire and occasional airstrikes in Baghouz, Syria, Sunday, March 3, 2019. (AP Photo/Andrea Rosa)

Columns of black smoke rise from the last small piece of territory held by Islamic State militants as U.S. backed fighters pound the area with artillery fire and occasional airstrikes, as seen from outside Baghouz, Syria, Sunday, March 3, 2019. Commanders of a U.S.-backed Syrian force fighting the Islamic State group in Syria say intense fighting is taking place as fighters advance toward the last piece of territory held by the extremists. (AP Photo/Sarah El-Deeb)

OUTSIDE BAGHOUZ, Syria – The Latest on the conflict in Syria (all times local):

3:40 p.m.

An official with the U.S.-backed force fighting the Islamic State group in eastern Syria says some 500 people, including fighters, have surrendered and evacuated the last area held by the extremists.

Ciyager, an official with the Kurdish-led Syrian Democratic Forces, says 200 more people are expected to evacuate the village of Baghouz later Monday.

Dozens of men, women and children climbed hills on foot and were later seen getting into small trucks after they were searched by SDF fighters.

An SDF spokeswoman said the offensive has slowed down but pressure is being kept up away from the evacuation corridor to prevent fighters from infiltrating or sabotaging the area.

She spoke on condition of anonymity because she was not authorized to speak to the press.

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10:40 a.m.

U.S.-backed Syrian fighters battling the Islamic State militants in their last foothold in Syria say they have been forced to slow down their push because the extremists are using civilians as human shields.

But despite the slowing, Mustafa Bali, a spokesman for the Kurdish-led Syrian Democratic Forces, tweeted on Monday that the battle to retake IS-held Baghouz "is going to be over soon."

SDF resumed its offensive to recapture Baghouz last Friday, after a two-week pause to allow for the evacuation of civilians.

Retaking the sliver of land would be a milestone in the devastating four-year campaign to end IS' self-proclaimed Islamic caliphate that once straddled vast territory across Syria and Iraq.

Bali said "we're slowing down the offensive" due to a small number of civilians held as human shields.