From across the frontier in Turkey, the Kurds and allied Syrian rebels could be seen raising their banners in place of the black IS flag and taking up positions at the Tal Abyad border post.
Fighters with the Kurdish People's Protection Units (YPG) militia waved their yellow banner as Turkish troops looked on from the other side of the frontier.
The capture of Tal Abyad, used by IS as a gateway from Turkey to its de facto capital Raqa city, was "the biggest setback to IS since it announced its caliphate one year ago," said Rami Abdel Rahman, the head of the Syrian Observatory for Human Rights monitoring group.
Tal Abyad's fall to the Kurds was "the most significant loss for IS in Syria yet," said Aymenn al-Tamimi, an expert at the Middle East Forum research group.
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The Kurdish forces and Syrian rebel allies launched a two-pronged attack on Tal Abyad on June 11, backed by air strikes by the US-led coalition fighting IS in Syria and Iraq.
The anti-IS forces encircled the town from the southwest and southeast before capturing the border crossing just north of it yesterday.
"IS withdrew without much fight yesterday... It was an easy win," said Ahmed Seyxo, a spokesman for the Democratic Union Party, the political party tied to the YPG.
The fighting had sent thousands of terrified residents fleeing into Turkey, with the UN refugee agency saying today that some 23,000 people had sought refuge across the border between June 3 and 15.
AFP journalists at Akcakale, on the Turkish side of the frontier, said there were no signs of fighting on the Syrian side early today, with only two or three families waiting to be allowed into Turkey.
"There are mines and car bombs everywhere, and bodies of IS fighters lying in the streets," said Sherfan Darwish, a spokesman for the Burkan al-Furat rebel group fighting alongside the Kurds.